The Illinois Natural Resources Geospatial Data Clearinghouse, hosted by the Illinois State Geological Survey, has pretty complete and detailed aerial photographs taken between 1938 and 1941. These digitized photos have enough resolution to identify individual houses and see cars on the roads.
Illinois Historical Aerial Photography (ILHAP) project photos are available here:
http://www.isgs.uiuc.edu/nsdihome/webdocs/ilhap/launchims.html
Monday, March 12, 2007
1938-1941 Illinois Aerial Photographs
1804-1891 Federal Township Plats of Illinois
It's interesting to see what local areas were like around the time the first settlers arrived. The State of Illinois has digitized plat maps available. Choose your county, then township, and browse to find what are probably the oldest available maps of the areas where you or your ancestors lived:
http://landplats.ilsos.net/Flash/FTP_Illinois.html
A searchable Illinois Public Domain Land Tract Sales database is here:
http://www.cyberdriveillinois.com/departments/archives/data_lan.html
A searchable database of Federal land conveyance records and images is here:
http://www.glorecords.blm.gov/
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