1. Diagram of the state of Illinois : accompanying report of 20th Novr. 1850 Yale Public content 1850. 2023-03-13T17:49:28Z. 2023-03-17T21:35:32Z. Clark, M. Lewis, cartographer. Office of the Surveyor General for Illinois and Missouri, November 20th, 1850. English. cartographic image. Public. Illinois.