Cost of producation in agriculture
Hopkins, J.A., Taylor, P.A.
Cost of producation in agriculture - Iowa 1935 - 388-432 p. - Producation, Agriculture Iowa Agricultural Experiment Station. Research Bulletin No. 184 .
Cost of producation in agriculture - Iowa 1935 - 388-432 p. - Producation, Agriculture Iowa Agricultural Experiment Station. Research Bulletin No. 184 .