- McLean County Historical Society, Bloomington, Ill
- University of Illinois at Urbana-Champaign, University Library
The corn head of a 9600 John Deere combine during the 1995 harvest. Today with combines, farmers can expect to harvest 100 acres of corn a day. How we learn about communities. 13 Science, Technology and Society; 15 Economics; 18 Social Systems; 17 Geography.
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