2010-02-09T19:34:03Z http://aerialphotos.grainger.uiuc.edu/oai.asp AP Champaign County, Illinois BWQ Cook County, Illinois BXC Mason County, Illinois BXF Peoria County, Illinois BXK Will County, Illinois RZ Fulton County, Illinois 1938 1938 1939 1939 1940 1940 1954 1954 AP:1940 Champaign County, Illinois, 1940 BWQ:1938 Cook County, Illinois, 1938 BXC:1939 Mason County, Illinois, 1939 BXF:1939 Peoria County, Illinois, 1939 BXK:1939 Will County, Illinois, 1939 BXK:1954 Will County, Illinois, 1954 RZ:1938 Fulton County, Illinois, 1938