Explore Chicago Collections
https://explore.chicagocollections.org/records/?f6-topics=Natural+%26+Built+Environments%3A%3ARailways&f3-topics=Work%3A%3AAdvertising&f7-cities=St.+Charles&f1-institutions=University+of+Chicago&f2-cities=Elgin&f5-cities=St.+Charles&browse-topics=yes