- McLean County Historical Society, Bloomington, Ill
- University of Illinois at Urbana-Champaign, University Library
Three farmers in overalls look over the engine of a metal wheeled tractor in the 1930s as a well-dressed man sits on the machine with a jug. Much of the early debate on tractors centered on the question of rubber vs. metal wheels. How we learn about communities; Communities and Geography; American Communities in History. 15 Economics; 16 History; 18 Social systems.
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