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From USFS Forest Products Laboratory:
Wood Handbook (individual chapters in PDF)
From Oregon State University Extension Service:
Lumber Size Control: Part 1--Measurement Methods
Lumber Size Control: Part 2--Size Analysis Considerations
Statistical Process Control Part 1: Introduction
Statistical Process Control Part 2: How and Why SPC Works (Preview)
Identifying Common Northwest Wood Species: A Woodworker's Guide
Voluntary Product Standards:
PS 20 Softwood Lumber Product Standard
Requies Adobe Acrobat Reader (download here)
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