- McLean County Historical Society, Bloomington, Ill
- University of Illinois at Urbana-Champaign, University Library
A single row corn picker machine helps harvest the crop in a McLean County field about 1935. By 1950, about half of the farms in McLean County had a mechanical corn picker. How we learn about communities; Communities and Geography; American Communities in History. 15 Economics; 16 History; 18 Social systems.
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