Farm machinery survey of selected districts in Pennsylvania
Josephson, H.B., Humphries, W.R., Church, L.M.
Farm machinery survey of selected districts in Pennsylvania - Pennsylvania 1929 - 1-15 p. - Farm Pennsylvania Agricultural Experiment Station. Bulletin No. 237 .
Farm machinery survey of selected districts in Pennsylvania - Pennsylvania 1929 - 1-15 p. - Farm Pennsylvania Agricultural Experiment Station. Bulletin No. 237 .