- McLean County Historical Society, Bloomington, Ill
- University of Illinois at Urbana-Champaign, University Library
Workers lay drainage tile in a trench of a field about 1940. The tile laid here are larger in size than those placed in 1880, but the process is the same. The vast underground network of tiles in McLean County greatly helped corn grow. How we learn about communities; Communities and Geography; American Communities in History. 15 Economics; 16 History; 18 Social systems.
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