Explore Chicago Collections
https://explore.chicagocollections.org/records/?f1-types=Archival%20Collections&browse-topics=yes&f4-institutions=University%20of%20Chicago&f5-topics=Natural%20%26%20Built%20Environments%3A%3ARailways&f3-cities=St.%20Charles&f6-topics=Work%3A%3AAdvertising&sort=title