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advertising American American Library Association American Medical Association amount analysis annual Association borrowed budget Bureau Census cent changes circulation cities clients decline Department depression determine direct relief diseases economic status effects employment estimate expenditures extent factors facts federal fiction hospitals hypotheses important income increased INDEX NUMBERS interest labor Magazine circulation Male ment mortality newspapers number of books number of copies obtained occupation PERCENTAGE DISTRIBUTION period persons physicians population problems programs Progress Administration projects Public Health Reports public library publishers rates readers reading behavior records relation Relief Administration relief agencies relief families relief policies rental libraries Reprint Research Memorandum sample selected SELECTED MAGAZINES sickness Social Aspects Sociology South Chicago Statistics stillbirths suggested supply Table tion titles Total trends tuberculosis types unem United University of Chicago Waples workers York York Public Library zines