Brown, Brock J.Murphy, James C.2020-07-242020-07-242002-12Murphy, J. C. (2002). The development and diffusion of the agricultural tractor, 1880-1954 (Unpublished thesis). Southwest Texas State University, San Marcos, Texas.https://hdl.handle.net/10877/12189No abstract prepared.Text345 pages1 file (.pdf)enfarm tractorstractorsagricultural innovationsThesis