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Research studies, notes, writings, correspondence, photographs and printed matter chiefly connected with Greenberg's position as sanitary engineer in the United States Public Health Service (1918-1932). Most of the papers concern hazards to the health of industrial workers, but also materials on several research projects including a study of Bacillus acidophilus and a project conducted in collaboration with C.-E.A. Winslow on skin temperature. The correspondence is largely professional, with only a few family letters and a small number from his teachers at Yale, C-E.A. Winslow and Ira V. Hiscock. These papers form part of the Contemporary Medical Care and Health Policy Collection in the Yale University Library.