Tractor Costs and Rates of Performance: A Preliminary Report of Data Secured in 1936 Covering the Cost of Operation and the Rate of Performance of Farm Tractors in Minnesota and Summaries for 1933, 1934 and 1935
Tractor Costs and Rates of Performance: A Preliminary Report of Data Secured in 1936 Covering the Cost of Operation and the Rate of Performance of Farm Tractors in Minnesota and Summaries for 1933, 1934 and 1935