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On agricultural policy : 1926-1938
Davis, Joseph Stancliffe, (1939)
Department bulletin / United States, Department of Agriculture
(1927)
Income in agriculture 1929-1935
Martin, Robert Fritz-Randolph, (1936)
Research in the social sciences : its fundamental methods and objectives
Park, Robert Ezra, (1929)
The social Economics of agriculture
Gee, Wilson, (1932)
Gee, Wilson, (1954)