MM-L-751H, FEDERAL SPECIFICATION: LUMBER; SOFTWOOD (13-AUG-1970) [S/S BY PS-20]

MM-L-751H, FEDERAL SPECIFICATION: LUMBER; SOFTWOOD (13-AUG-1970) [S/S BY PS-20]., This specification covers all species of softwood lumber listed in Product Standard 20 (PS 20). Softwood lumber is intended for use in construction and fabrication of engineered and nonengineered structures and other end items for which softwood is a convenient, suitable material.