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Causes of death by occupation
(United State Government of Printing Office, Washington, 1930)
Personnel research agencies
(United State Government of Printing Office, Washington, 1930)
Report of Pennsylvania Railroad Wage Data
(Bureau of Labor Statistics, Washington, 1930)
Wages and Hours of Labor in the Iron and Steel Industry, 1929
(Government printing office, Washington, 1930)
Wages and hours of Labour in Foundries and Machine Shops, 1929
(Government printing office, Washington, 1930)