PRESERVATIVE TREATED STRESS RATED JOISTS AND PLANKS FOR USE IN CRIBBING FOR BAILEY TYPE BRIDGES
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SPECIFICATION/STANDARD DATA
81348-MM-L-751 GOVERNMENT SPECIFICATION
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SPECIES-GRADE AND GRADING ASSOCIATION
"DOUGLAS FIR SELECT STRUCTURAL WEST COAST LUMBER INSPECTION BUREAU OR DOUGLAS FIR SELECT STRUCTURAL WESTERN WOOD PRODUCTS ASSOCIATION OR LARCH SELECT STRUCTURAL WESTERN WOOD PRODUCTS ASSOCIATION OR PINE, SOUTHERN SELECT STRUCTURAL SOUTHERN PINE INSPECTION BUREAU"