Explore Chicago Collections
https://explore.chicagocollections.org/records/?browse-cities=yes&f1-cities=Chicago&f2-topics=Events+%26+Movements%3A%3ABefore+Chicago+%28until+1837%29&f3-cities=Chicago&f4-topics=Events+%26+Movements%3A%3ABefore+Chicago+%28until+1837%29&f5-topics=Work%3A%3ABusiness