213 pages, 1 unnumbered page : including tables, diagrams ; 24 cm.

Comparison of an eight-hour plant and a ten-hour plant / Report by Josephine Goldmark and Mary D. Hopkins, on an investigation by Philip Sargant Florence, and associates under the general direction of Frederic S. Lee. Prepared by direction of the Surgeon General.

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Hopkins, Mary D. (Mary Della)

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Comparison of an eight-hour plant and a ten-hour plant / Report by Josephine Goldmark and Mary D. Hopkins, on an investigation by Philip Sargant Florence, and associates under the general direction of Frederic S. Lee. Prepared by direction of the Surgeon General.