National Industrial Conference Board. Hours of work as related to output and health of workerse: metal manufacturing industries. Boston, Mass.: The Board. c1919; Labor Law; vii, 62 p. 23 cm.
National Industrial Conference Board. Hours of work as related to output and health of workerse: metal manufacturing industries. Boston, Mass.: The Board. c1919; Labor Law; vii, 62 p. 23 cm.
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