- McLean County Historical Society, Bloomington, Ill
- University of Illinois at Urbana-Champaign, University Library
Concrete block machines like this one were available to make one's own blocks such as the one on the bottom left. Among the new materials to become popular in the early 1900s was concrete block for construction. Farmers purchased machines like this to make their own blocks. How we learn about communities; Communities and Geography; American Communities in History. 15 Economics; 16 History; 18 Social systems.
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