Sydenstricker, Edgar, 1881-1936.
A method of classifying families according to incomes in studies of disease prevalence / by Edgar Sydenstricker and Willford I. King.
Washington, D.C. : Government Printing Office, 1920.
Working class -- Health and hygiene.
Public health -- United States.
King, Willford Isbell, 1880-1962.
Philadelphia Area Center for History of Science
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