Child labor and the work of mothers in the beet fields of Colorado and Michigan
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書誌事項
Child labor and the work of mothers in the beet fields of Colorado and Michigan
（Bureau publication / U.S. Department of Labor, Children's Bureau, no. 115）
Goverment Printing Office, 1923
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注記
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
