Safety code for the construction, care and use of ladders : American Society of Safety Engineers, sponsor : tentative American standard approved July 25, 1923, by American Engineering Standards Committee
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Safety code for the construction, care and use of ladders : American Society of Safety Engineers, sponsor : tentative American standard approved July 25, 1923, by American Engineering Standards Committee
（Bulletin / Bureau of Labor Statistics, no. 351）（Safety code series）
U.S. G.P.O., 1923
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At head of title: United States Department of Labor... Bureau of Labor Statistics...
"ASEC-No. A14-1923"