U. S. Department of Labor Children's Bureau; Infant Mortality: Results of a Field Study in Johnstown, Pa., Based on Births in One Calendar Year. ... No. 3, Bureau Publication No. 9; pp. 21-93

U. S. Department of Labor Children's Bureau; Infant Mortality: Results of a Field Study in Johnstown, Pa., Based on Births in One Calendar Year. ... No. 3, Bureau Publication No. 9; pp. 21-93

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