- McLean County Historical Society, Bloomington, Ill; Hartzold, Susan; Matejka, Michael, 1953-
- University of Illinois at Urbana-Champaign, University Library
Workers for the National Concrete Block Co. construct the foundation for a building. The National Concrete Block Co. formed concrete blocks and other structural shapes for local construction. Concrete became popular as a building material in the late 1800s. How we learn about communities; Building a better home for the three little pigs. 16 History; 13 Science, Technology and Society; 15 Economics; 18 Social Systems.
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