Horse and tractor power on Illinois farms
Johnston, P.E., Wills, J.E.
Horse and tractor power on Illinois farms - Urbana 1933 - 270-332 p. - Illinois Agricultural Experiment Station. Bulletin No. 395 .
Horse and tractor power on Illinois farms - Urbana 1933 - 270-332 p. - Illinois Agricultural Experiment Station. Bulletin No. 395 .