One shouldn't get legal advice from a map, but this makes an excellent point that information can turn up in the most unexpected of places. This image comes from the "Rail road and county map of Illinois showing its internal improvements" published in 1854 in New York and digitized and available in the American Memory site at the Library of Congress website.
I did think it was interesting that the scroll of a pen could be used for the seal. The section on Wills mentions Beadle's American Lawyer, which I might want to see if Google Books has.
Starting out looking for a Civil War era map and have ideas on probate and court records--a person just never knows.
