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＜図書＞
The four hour day in coal : a study of the relation between the engineering of the organization of work and the discontent among the workers in the coal mines / by Hugh Archbold ...

出版者	New York : Wilson
出版年	1922
大きさ	xiii, 148 p. : tables, diagrs. ; 21 cm.
著者標目	Archbald, Hugh
件　名	Coal mines and mining -- United States  全ての件名で検索 Coal miners -- United States  全ての件名で検索 Hours of labor

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