This image is a derivative work of the following images: File:Illinois_Locator_Map.PNG licensed with Cc-by-sa-2.5, Cc-by-sa-3.0-migrated, GFDL, PD-USGov-DOC-Census...
Calhoun County Illinois 1825.png Carroll County Illinois 1839.png Cass County Illinois 1837.png Cass County Illinois 1845.png Champaign County Illinois 1833...
Government publications; Collected works Publication date 1837 publication_date QS:P577,+1837-00-00T00:00:00Z/9 Accession number Resolution InfoField English:...