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Western Lumber Grading Rules 2021 (Coil Bound)
The latest edition of WWPA Grading Rules for Douglas Fir, Engelmann Spruce, Hemlock-True Firs, Idaho White Pine, Incense Cedar, Lodgepole Pine, Ponderosa Pine, Sugar Pine, Western Larch, and Western Red Cedar. Includes Base Design Values. Published by Western Wood Products Association (WWPA).