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1
The development and evaluation of effective symbol signs
Washington, D.C. : U.S. Dept. of Commerce, National Bureau of Standards : For sale by the Supt. of Docs., U.S. G.P.O., 1982Format: Government Document Book
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2
Symbols for industrial safety
Washington, DC : [Springfield, Va.] : U.S. Dept. of Commerce, National Bureau of Standards ; [National Technical Information Service, distributor], 1982Format: Government Document Book