00337nam a2200097Ia 4500082002000000100008200020245007200102260004400174300001600218500000500234  a338.16bIo64.ED  aIowa State University, Center for Agricultural and Economic Development, 1965  aEconomic development of agriculture; the modernization of farmingb  aAmesbIowa State University Pressc1965  aviii, 314p.  a