Unwarranted conclusions regarding the eight-hour and ten-hour workday : a critical review of a “Comparison of an eight-hour plant and a ten-hour plant." United States public health bulletin no. 106
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Unwarranted conclusions regarding the eight-hour and ten-hour workday : a critical review of a “Comparison of an eight-hour plant and a ten-hour plant." United States public health bulletin no. 106
（Special report, no. 14）
National Industrial Conference Board, c1920
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