Books by Gertrude Underhill Light:
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Light, Gertrude Underhill, 1871-, contrib.: Child Labor and the Work of Mothers in the Beet Fields of Colorado and Michigan (publication #115; Washington: GPO, 1923), by United States Children's Bureau, also contrib. by Ellen Nathalie Matthews (page images at Harvard)
Additional books by Gertrude Underhill Light in the extended shelves:
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Light, Gertrude Underhill, 1871-: Child labor and the work of mothers in the beet fields of Colorado and Michigan ... (Govt. print. off., 1923), also by United States Children's Bureau and Ellen Nathalie Matthews (page images at HathiTrust)
Find more by Gertrude Underhill Light at your library, or elsewhere.