Softwood Veneer and Plywood Manufacturing (U.S.) — NAICS 321212

1. Overview

This industry peels logs into thin sheets of wood (veneer) and glues those sheets into structural panels (plywood). The output is the workhorse sheet material of American homebuilding: roof and wall sheathing, subflooring, and industrial panels, plus the veneer that feeds engineered-wood beams. It is a mature, capital-intensive, cyclical commodity manufacturing business — mills run 24/7, sell a standardized product priced daily like a raw material, and rise and fall with home construction.

Why an investor should care: it is a leveraged bet on U.S. housing starts and repair-and-remodel spending, with an added structural twist — plywood has been losing share for four decades to a cheaper substitute, oriented strand board (OSB), which is made from wood strands rather than peeled veneer. Understanding this industry means understanding both the housing cycle and the slow plywood-versus-OSB share war.

Ways in: the public route is narrow. There is essentially one large, relatively pure public producer — Boise Cascade (NYSE: BCC) — plus diversified timber and wood-products companies (Weyerhaeuser, Rayonier following its 2026 merger with PotlatchDeltic, West Fraser) that make plywood as one line among many. Much of the industry's capacity sits inside private and family-held firms (Georgia-Pacific/Koch, Roseburg, RoyOMartin, Murphy, Freres). Private investors reach it through those companies, through timberland, or through building-products distribution and specialty-panel niches.

2. What it is and how it's structured

Scope. NAICS 321212 covers U.S. establishments that manufacture softwood veneer (thin wood sheets peeled or sliced from conifer logs such as Douglas fir and Southern yellow pine) and softwood plywood (panels made by cross-laminating those veneers with waterproof adhesive, usually phenol-formaldehyde resin) [1]. Softwood plywood is a structural product: rated sheathing, sanded panels, concrete-forming panels, and specialty industrial and marine grades.

The production process. A plywood mill receives peeler-quality softwood logs — principally southern pine in the South and Douglas fir and other conifers in the West. Logs are debarked, cut into blocks, and usually conditioned with heat. A rotary lathe then peels each block into continuous veneer. The veneer is clipped, dried, graded, and patched; phenol-formaldehyde adhesive is applied; and sheets are cross-laminated so that adjacent grain directions alternate. The layup is cured under heat and pressure, then trimmed, sanded, graded, and stamped. The cross-lamination gives plywood dimensional stability and strength in both panel directions. Common output includes structural sheathing, subflooring, roof decking, siding, concrete forms, pallets, containers, and specialty industrial panels. The standard 4-by-8-foot panel is the familiar retail format, but industry production is normally reported on a 3/8-inch equivalent basis, a volume-conversion convention rather than literal sheet count [2][3].

What it explicitly excludes (adjacent NAICS codes an investor should not conflate):

• 321211 — Hardwood Veneer and Plywood Manufacturing: the decorative/furniture-grade cousin (oak, birch, maple faces). Different end markets and, importantly, different formaldehyde rules (see §7) [1].
• 321219 — Reconstituted Wood Product Manufacturing: OSB, particleboard, MDF, and hardboard — panels pressed from strands, chips, or fibers rather than peeled veneer. This is where softwood plywood's biggest competitor, OSB, is counted — so the single largest structural-panel rival lives in a different industry code [1].
• 321213 — Engineered Wood Member Manufacturing: laminated veneer lumber (LVL), I-joists, glulam, and trusses. These consume softwood veneer but are classified separately [1].
• 321113 — Sawmills: dimensional softwood lumber (2x4s), not panels [1].

Ownership mix. A small number of large, integrated producers dominate. Federal data count just 52 firms operating 80 establishments [4][5]. APA — The Engineered Wood Association counted 47 U.S. plywood mills in 2022, with its producer ranking placing Georgia-Pacific first, followed by Boise Cascade, Roseburg Forest Products, RoyOMartin, Swanson Group, Hunt Plywood, Winston Plywood and Veneer, Scotch Plywood, Hardel Mutual Plywood, Murphy Plywood, and Hood Industries, among others [6]. Most meaningful capacity is held by a handful of companies — a mix of one focused public manufacturer, two or three diversified public timber/wood-products firms, and several large privately or family-owned mills. Many of the biggest players are vertically integrated, owning the timberland that supplies their peeler logs, which cushions them against log-cost swings.

3. How big it is

Federal figures for NAICS 321212 (U.S.):

So this is a ~$6.6 billion factory-gate industry employing about 13,000 people at roughly 80 large plants — an average of about 165 workers per plant, confirming these are big, capital-intensive mills, not small shops. APA data show 11.14 billion square feet of U.S. plywood capacity, 7.90 billion square feet of production, and 71% utilization in 2022, all on a 3/8-inch equivalent basis [6]. (Note: a separate industry environmental declaration cites only 7.90 billion square feet of 2022 capacity, materially below APA's figure — the sources may use different coverage or capacity definitions [3].) Fastmarkets reported 3.88 billion square feet produced in the first half of 2024, down 4.3% year over year [8].

Concentration trend. The industry has a concentrated leading group but a meaningful tail of regional and specialty producers, and measured concentration actually declined between the 2017 and 2022 censuses. In 2017, the corresponding figures were 55 companies, CR4 of 61%, CR8 of 75%, CR20 of 95%, and an HHI of 1,276 [2].

Undercount caveat — the opposite problem. Unlike industries dominated by tiny or informal operators, federal statistics capture this industry well: a census of ~80 sizable establishments leaves little to miss. The trap runs the other way. Beware headline "U.S. plywood market" figures in the tens of billions of dollars — those include imports, hardwood plywood, and wholesale/retail margins, and are not comparable to the $6.6 billion factory-gate shipments that federal data measure for domestic softwood mills [4]. (Note: the CR50 concentration ratio is suppressed in the source and is not reported here.)

4. The investable universe

Public options are limited, and only one is close to a pure play. Producers make plywood alongside lumber, OSB, engineered wood, and timberland, so "buying plywood" in public markets means buying a diversified wood-products company.

REIT = real estate investment trust, a pass-through structure that pays little corporate tax and distributes most income; MMSF = million square feet; PLV = parallel-laminated veneer (used internally to make LVL).

Major private / other owners (not investable via public shares):

• Georgia-Pacific — owned by Koch Industries (acquired 2005); the largest U.S. plywood producer by APA's 2022 ranking, though it has trimmed capacity (e.g., closing its Emporia, VA plywood mill in 2025, ~550 jobs, citing housing affordability challenges and a 30-year low in existing-home sales) [6][13][14].
• Roseburg Forest Products — large family-owned Oregon producer (founded 1936) of plywood, engineered wood, and veneer; also a major private timberland owner; ranked third by APA in 2022 [6][15].
• RoyOMartin — Louisiana-based family firm; ranked fourth by APA in 2022 [6].
• Murphy Company and Freres Engineered Wood — Pacific Northwest family firms in softwood plywood/veneer; Freres also pioneered the mass plywood panel (a large-format structural panel) [16].

Bottom line: for public-market exposure, Boise Cascade is the anchor; the REITs and West Fraser add plywood as a minority of a broader wood-products mix.

5. How the money works

Owners make money on a spread: the price of finished panels minus the cost of logs, resin, energy, and labor, multiplied by how many square feet the mill can push out. The key operating levers:

• Capacity utilization. These are high-fixed-cost plants. Running mills full versus curtailed is the single biggest swing factor in profitability. In downturns, producers take downtime and idle lines; in upturns they run flat out and margins expand fast.
• Commodity price spread. Panels are a commodity — grade-stamped and interchangeable — priced on published benchmarks (e.g., Random Lengths) that move daily. Producers are price-takers. When panel prices spike (as in the 2020–21 building boom) margins balloon; when they revert, margins compress. The BLS producer-price index for softwood plywood rose from 111.3 in 2020 to 175.9 in 2021 (a 58% increase), then fell to 133.1 in 2023 and 128.0 in 2024 [2].
• Input costs. Peeler/veneer logs are the dominant cost. Boise Cascade's 2025 10-K shows wood fiber representing approximately 37% of its Wood Products segment's materials, labor, and other operating expenses, with logs about 80% of wood-fiber cost; 88% of its log supply came from private landowners or dealers [9]. Phenol-formaldehyde resin tracks oil/chemical prices; energy and labor round it out. Vertical integration into timberland (Weyerhaeuser, Rayonier, Roseburg) smooths log-cost volatility and captures more of the value chain. Boise notes that western logs cost more per unit than southern logs because of harvest and delivery costs, weather, slower growth, and public-land constraints [9].
• Product mix / value-add. Commodity sheathing competes head-on with cheaper OSB. Specialty and industrial grades — sanded, overlaid concrete-form panels, marine, siding, RV/truck-bed and other industrial panels — carry higher, steadier margins and face less OSB substitution, so mix-shift toward specialty is a common margin strategy (the St. Maries mill now owned by Rayonier is a deliberately industrial-grade example) [11].
• Distribution pull-through. Integrated players like Boise Cascade also distribute building products, capturing margin twice and smoothing the manufacturing cycle [9].

Because fixed costs are high and prices are volatile, earnings are highly cyclical — feast in housing booms, famine in downturns. Boise Cascade's combined Wood Products segment illustrates this: it earned $231.5 million in 2024 but only $5.8 million in 2025, as lower plywood prices (down 6%) and volumes (down 4%), planned downtime, and higher per-unit conversion costs overwhelmed modest input relief [9].

6. What drives demand

• Repair and remodeling (R&R). EPA's 2019 end-market allocation identified R&R as the largest single market at 37% of demand [2]. This is a large, more stable secondary market that softens (but does not eliminate) the new-construction cycle. R&R activity is influenced by household income, home equity, storm damage, and existing-home turnover.
• New residential construction. The second-largest driver at 25% of demand per EPA's allocation [2]. Softwood plywood goes into roof sheathing, wall sheathing, and subfloors, so demand tracks U.S. housing starts — especially single-family, which uses more panel per home than multifamily. Boise Cascade reported 943,000 single-family and 415,700 multifamily starts in 2025, versus 1.013 million and 354,200 respectively in 2024 [9][17].
• Nonresidential construction accounts for approximately 18% of demand [2]. Concrete forming, crating, transportation (truck beds, RVs), and material handling round out the remainder.
• The OSB substitution overhang. OSB now holds roughly three-quarters of the North American structural-panel market, having displaced plywood in commodity sheathing over decades on price [18]. U.S. plywood production fell from 17.48 billion square feet in 2000 to 7.90 billion in 2022, while U.S. OSB production rose from 11.91 billion to 15.36 billion square feet over the same period [6]. Plywood retains an edge where stiffness, moisture recovery, fastener holding, or specialty grades matter. Net: total structural-panel demand rises with housing, but plywood's share of that demand keeps drifting toward OSB — a persistent volume headwind.
• Imports. APA reported 1.95 billion square feet of non-Canadian U.S. softwood-plywood imports in 2022, including 1.01 billion from Brazil, 522 million from Chile, and 298 million from China, against only 294 million square feet of non-Canadian exports [6]. Exchange rates, ocean freight, trade enforcement, and foreign fiber costs therefore influence domestic pricing.

7. Regulation

• Formaldehyde — a favorable carve-out. EPA's formaldehyde emission standards for composite wood products (TSCA Title VI, the Toxic Substances Control Act rule that mirrors California's CARB program) target hardwood plywood, particleboard, and MDF. Structural softwood plywood and OSB are exempt, because they are bonded with moisture-resistant phenol-formaldehyde or no-added-formaldehyde adhesives governed by their own product standards [19][20]. This spares softwood mills a compliance burden their hardwood (321211) and reconstituted-wood (321219) cousins carry.
• Air emissions (PCWP NESHAP). Veneer dryers, presses, boilers, and finishing equipment emit volatile organic compounds and hazardous air pollutants. EPA's June 2026 plywood and composite-wood amendments identified 33 affected NAICS 321212 facilities — the major-source regulatory universe, not the entire industry [21]. Compliance may require emissions testing, work-practice changes, and control equipment, with disproportionate economics for older or smaller mills.
• Product standards and grade-stamping. Panels are manufactured to the U.S. Voluntary Product Standard PS 1 (and PS 2 for performance-rated panels) and carry third-party grade stamps (e.g., APA — The Engineered Wood Association) that certify grade, span rating, and exposure durability. These stamps are the passport into building codes and specifications [19].
• Trade policy. In 2025 the federal government imposed Section 232 tariffs on imported timber, lumber, and certain derivatives (softwood lumber +10%; kitchen cabinets, vanities, and upholstered wood furniture at higher rates). Notably, plywood under HTS heading 4412 was excluded from these tariffs [22]. Separately, longstanding antidumping/countervailing duties on Chinese hardwood plywood affect the 321211 industry, not softwood structural plywood. Net effect for softwood plywood: minimal direct tariff impact, though the broader wood-cost and construction-demand environment is affected.
• Workplace safety. BLS recorded a 2024 total recordable injury and illness rate of 4.5 cases per 100 full-time workers for NAICS 321212 [23]. Wood dust is both a respiratory and combustible-dust hazard, subject to OSHA guidance [24]. Standard air-emissions permitting (resin presses, veneer dryers, wood-dust), Clean Air/Clean Water compliance, and OSHA workplace rules apply; timberland-integrated players also face forestry and endangered-species regulation upstream.

8. Competitive dynamics and consolidation

Federal concentration data describe a moderately concentrated, consolidating industry: the top 4 firms make 53% of shipments, the top 8 make 69%, and the top 20 make 93% — yet the HHI of 1,036 sits below the 1,500 threshold the antitrust agencies treat as "moderately concentrated," reflecting real competition among the leaders [4].

The through-line is capacity discipline. Facing OSB's advance and cyclical demand, incumbents have been closing older, higher-cost plywood mills (Georgia-Pacific's Emporia closure, citing housing affordability and weak existing-home sales) while the most committed players invest and acquire to modernize and scale — Boise Cascade bought Coastal Plywood (two Southeast softwood plywood mills, >200 MMSF combined) for ~$512 million in 2022 and has since poured capital into veneer and engineered-wood lines that pull veneer through its own plants [9][25]. The strategic logic: get bigger and lower-cost in commodity grades, and shift mix toward specialty and engineered products that OSB cannot easily replace.

Geographically, production is concentrated in the U.S. South (Southern yellow pine — historically about two-thirds of output) and the Pacific Northwest/Inland West (Douglas fir and other species) [26]. A mill's fiber basket and geography matter: southern pine grows quickly and is largely sourced from private timberland, while western mills face slower growth cycles, seasonal operating constraints, longer haul distances, and greater exposure to public-land timber availability [9].

9. Risks

• Housing cyclicality. The dominant risk. A downturn in starts hits volumes and prices simultaneously, and high fixed costs magnify the earnings swing.
• OSB substitution. A secular, not cyclical, threat: plywood keeps ceding commodity-sheathing share to cheaper OSB [18]. Producers reliant on commodity grades face slow structural erosion.
• Input-cost squeeze. Peeler-log scarcity/price, resin (oil-linked) costs, and energy can compress the price-cost spread, especially for non-integrated mills.
• Commodity price volatility. Panel prices are notoriously boom-bust; the 2020–21 spike and subsequent normalization is the recent template.
• Import competition. Nearly 2 billion square feet of non-Canadian imports (mainly Brazil, Chile, China) put pressure on domestic pricing [6].
• Concentration and capital intensity. Few buyers of scale, big fixed costs, and long-lived assets make it hard to exit gracefully — hence periodic mill closures.
• Environmental compliance. EPA's PCWP NESHAP affects 33 major-source facilities; compliance costs fall disproportionately on older or smaller mills [21].
• Operational risks. Dryer and press failures, boiler outages, fire, hurricanes, floods, and constrained rail or truck service can shut down continuous-flow mills. The 4.5-per-100 injury rate reflects inherent workplace hazards [23].
• Regulatory/trade shifts. While softwood plywood dodged the 2025 Section 232 tariffs, future trade actions, timber-supply policy on federal lands, or environmental rules could move log costs and competitive dynamics.
• Substitution beyond OSB. Longer term, mass timber and alternative sheathing systems could reshape demand at the margin.

10. How to invest and the outlook

Public routes.

• Boise Cascade (NYSE: BCC) is the clearest listed exposure — a large plywood/veneer manufacturer (11 plants, ~2.7 billion square feet of capacity) plus building-products distributor. It offers the most direct read on softwood-panel economics, but is itself diversified across engineered wood and distribution; plywood is about 31% of its Wood Products segment [9].
• Timber REITs — Weyerhaeuser (NYSE: WY) and Rayonier (NYSE: RYN) — give housing-cycle and wood-products exposure with an income (dividend) tilt from their REIT structure and timberland base; plywood is a minor line within each. Rayonier's January 2026 merger with PotlatchDeltic added the St. Maries industrial-grade plywood mill to its portfolio [10][11].
• West Fraser (NYSE/TSX: WFG) is more an OSB and lumber play — useful if the thesis is "own the substitute that is winning share" rather than plywood itself [12].
• Because no listed pure-play plywood ETF exists, investors typically combine a homebuilder/building-products view with one of the names above.

Private routes.

• Direct ownership or credit in private mills (Georgia-Pacific is inside Koch; Roseburg, RoyOMartin, Murphy, Freres are family-held) — generally reachable only via private equity, private credit, or M&A.
• Timberland as the upstream asset (via private funds, TIMOs — timberland investment management organizations — or the REITs). Georgia-Pacific and Roseburg demonstrate the potential benefits of vertical integration.
• Downstream building-products distribution and specialty-panel niches (industrial, concrete-form, marine), which capture demand with less OSB competition. Boise shows that distribution integration can capture downstream margin and stabilize mill offtake.

Near-term drivers to watch (forward-looking).

• The trajectory of U.S. housing starts and mortgage rates — the master variable for volumes and prices.
• R&R spending, a partial cyclical cushion.
• OSB vs. plywood price spread and share trends — the pace of substitution.
• Capacity actions — further closures (bullish for surviving-mill pricing) versus new capacity.
• Log and resin costs, and any new trade/timber-supply policy.
• Import volumes and pricing from Brazil, Chile, and other sources.

Outlook (judgment, not fact). Softwood plywood is a mature, cyclical, share-losing commodity business with a resilient specialty core. The likely path is continued volume erosion to OSB in commodity grades, offset by consolidation, mill modernization, and mix-shift into specialty/engineered products among the survivors. The cyclical upside is real and can be large in a housing recovery; the secular case rests on the value-added and integrated players, not on commodity sheathing.

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Sources

1. U.S. Census Bureau. "2022 NAICS Definitions — 321212 Softwood Veneer and Plywood Manufacturing (and adjacent codes 321211, 321213, 321219, 321113)." 2022. https://www.census.gov/naics/
2. U.S. Environmental Protection Agency. "Economic Impact Analysis for Plywood and Composite Wood Products NESHAP Amendments." June 2026. (Tables 2-4, 2-5, 2-6, 2-8; concentration trends, shipments history, end-market allocation, PPI index.) https://www.epa.gov/system/files/documents/2026-06/plywood_eia_neshap_final_20260629.pdf
3. American Wood Council / APA — The Engineered Wood Association. "Environmental Product Declaration: Southern Softwood Plywood." 2025. https://web-media.awc.org/wp-content/uploads/2025/05/23191255/Southern-Plywood-EPD-Final2-07222025.pdf
4. U.S. Census Bureau. "Economic Census 2022 — Concentration Ratios / Selected Statistics, NAICS 321212." 2022. (Firms 52; receipts $6,611,995 thousand; CR4 53.3%, CR8 69.3%, CR20 93%; HHI 1,036.2; CR50 suppressed.)
5. U.S. Census Bureau. "County Business Patterns (CBP), NAICS 321212." 2023. (80 establishments; 13,161 employees; $956,703 thousand annual payroll.) https://data.census.gov/profile/321212_-_Softwood_Veneer_and_Plywood_Manufacturing?codeset=naics~321212
6. APA — The Engineered Wood Association. "APA Market Outlook." 2022. (Tables 9, 27, 35; U.S. capacity 11.14B sq ft, production 7.90B sq ft, 71% utilization, 47 mills; producer ranking; historical production series; import data.) https://www.apawood.org/Data/Sites/1/documents/mktrsch/E88-Members-Edition-Final.pdf
7. U.S. Small Business Administration. "Table of Small Business Size Standards, NAICS 321212 (1,250 employees)." 2023. https://www.sba.gov/document/support-table-size-standards
8. Fastmarkets. "North American panel production falls in first half compared to 2023." 2024. https://www.fastmarkets.com/insights/north-american-panel-production-falls-in-first-half-compared-to-2023/
9. Boise Cascade Company. "Form 10-K for fiscal year ended December 31, 2025." SEC, 2026. (Wood Products segment $1.61B; 11 plywood/veneer plants; 2.725B sq ft capacity; plywood 31% of segment; fiber cost structure; segment earnings $5.8M vs. $231.5M prior year; housing starts data.) https://www.sec.gov/Archives/edgar/data/1328581/000132858126000006/bcc-20251231.htm
10. Weyerhaeuser Company. "Form 10-K for fiscal year ended December 31, 2025." SEC, 2026. (Wood Products $4.96B; softwood plywood ~$155M; 3 U.S. plywood facilities; 610 MMSF capacity; 322 MMSF production.) https://www.sec.gov/Archives/edgar/data/106535/000119312526051422/wy-20251231.htm
11. Rayonier Inc. "First Quarter 2026 Results — Merger with PotlatchDeltic." 2026. (Merger completed January 30, 2026; inherited St. Maries, ID plywood mill ~150 MMSF capacity.) https://ir.rayonier.com/news/news-details/2026/Rayonier-Reports-First-Quarter-2026-Results/default.aspx
12. West Fraser Timber Co. "Products — OSB and Plywood / Engineered Wood Products." 2025. https://osb.westfraser.com/
13. The Astorian. "Koch acquires Georgia-Pacific." 2005. https://dailyastorian.com/2005/11/13/koch-acquires-georgia-pacific/
14. Georgia-Pacific. "Georgia-Pacific to Close Emporia Plywood Facility." 2025. (Closure announcement citing housing affordability and 30-year low in existing-home sales; ~550 jobs affected.) https://news.gp.com/2025/05/georgia-pacific-to-close-emporia-plywood-facility
15. Roseburg Forest Products. "About Us." 2025. https://www.roseburg.com/who-we-are/about-us/
16. Murphy Company. "Veneer & Plywood Products." 2025. https://murphycompany.com/; Freres Engineered Wood. "Oriented Strand Board vs. Plywood / Mass Plywood Panel." https://frereswood.com/blog/market-report-oriented-strand-board-vs-plywood/
17. John Burns Research and Consulting. "Sheathing Demand Meter / Forecast" (demand tied to housing starts and R&R). 2024. https://jbrec.com/research/building-products-package/building-products-demand-meter-sheathing/
18. Wood Central / APA — The Engineered Wood Association. "OSB Growth Sounds Warning for Plywood Producers" (OSB ~75% of North American structural-panel market). 2024. https://woodcentral.com.au/flashback-osb-growth-sounds-warning-for-plywood-producers/
19. APA — The Engineered Wood Association. "Structural Plywood, OSB Exempt from New Formaldehyde Ruling (EPA TSCA Title VI); PS 1 grade-stamping." https://www.apawood.org/structural-plywood-osb-exempt-from-new-formaldehyde-ruling
20. U.S. Environmental Protection Agency. "Frequent Questions for Regulated Stakeholders About Implementing Formaldehyde Standards for Composite Wood Products." https://www.epa.gov/formaldehyde/frequent-questions-regulated-stakeholders-about-implementing-formaldehyde-standards
21. U.S. Environmental Protection Agency. "Plywood and Composite Wood Products Manufacture: National Emission Standards for Hazardous Air Pollutants (NESHAP)." 2026. (33 affected NAICS 321212 facilities.) https://www.epa.gov/stationary-sources-air-pollution/plywood-and-composite-wood-products-manufacture-national-emission
22. The White House / Federal Register. "Adjusting Imports of Timber, Lumber, and Their Derivative Products (Section 232)" — softwood lumber +10%; plywood under HTS 4412 excluded. 2025. https://www.federalregister.gov/documents/2025/10/06/2025-19482/adjusting-imports-of-timber-lumber-and-their-derivative-products-into-the-united-states
23. U.S. Bureau of Labor Statistics. "Industry Injury and Illness Data, 2024 — NAICS 321212." (Total recordable rate 4.5 per 100 full-time workers.) https://www.bls.gov/web/osh/table-1-industry-rates-national.htm
24. Occupational Safety and Health Administration. "Combustible Dust in Industry: Preventing and Mitigating the Effects of Fire and Explosions." https://www.osha.gov/publications/3371combustible-dust
25. Boise Cascade Company. "Boise Cascade Reaches Agreement to Acquire Coastal Plywood Operations (~$512M; two Southeast softwood plywood mills, >200 MMSF)." 2022. https://www.bc.com/boise-cascade-reaches-agreement-to-acquire-coastal-plywood-operations/
26. Willamette Valley Company. "Major Milestones of the Softwood Plywood Industry" (regional split: U.S. South ~two-thirds of output, Pacific Northwest/Inland West ~one-third). https://wilvaco.com/uncategorized/major-milestones-of-the-softwood-plywood-industry/