- McLean County Historical Society, Bloomington, Ill
- University of Illinois at Urbana-Champaign, University Library
A 45 Cat Challenger pulls a Landall plow in a cornfield early in the season. This type of chisel plowing breaks up the soil and the previous year's remaining dead cornstalks at the beginning of a farming year on a till farm. How we learn about communities. 13 Science, Technology and Society; 15 Economics; 16 History.
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