Child labor and the work of mothers in the beet fields of Colorado and Michigan ..
At head of title: U.S. Department of labor. James J. Davis, secretary. Children's bureau. Grace Abbott, chief "The investigation was planned and carried on under the direction of Ellen Nathalie Matthews ... Dr. Gertrude A. [sic] Light made physical examinations of children in the Colorado beet-field region and analyzed the findings with reference to health."--Letter of transmittal, p. v
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