Power and machinery in agriculture
Hurst, W.M., Church, L.M.
Power and machinery in agriculture - Washington 1933 - 1-39 p. - Agriculture, Machinery United States Department of Agriculture. Miscellaneous Publication No. 157 .
Power and machinery in agriculture - Washington 1933 - 1-39 p. - Agriculture, Machinery United States Department of Agriculture. Miscellaneous Publication No. 157 .