Here are some links to websites where you may be able to find Chicago postcards & images, as well as other historical sites.
www.judnick.com/Judnick/Links.htm – This website has lots more links to collectors, dealers, etc.
Here are some links to sites that will help with research on the city of Chicago.
www.chicagoancestors.org – NEW! great website for Chicago research, by the Newberry Library.
www.architecture.org – Chicago Architecture Foundation
www.chicagohistoricalphotos.com – some very nice photos of Chicago, this is a retail site as well
www.chicagohistory.info – lots of history of Chicago, as well as images
www.chicagohs.org – Chicago History Museum
www.chicago.urban-history.org/res/res04.shtml – info of Jazz Age Chicago, has many more links
www.chipublib.org – the Chicago Public Library
www.corsinet.com/chicago/chicagot.html – lots of interesting facts
www.encyclopedia.chicagohistory.org – website of the Encyclopedia of Chicago
www.edgewaterhistory.org – website devoted to the Edgewater neighborhood of Chicago
www.tc.umn.edu/~tmisa/biblios/WWW_Chicago.html – links to Chicago history websites
www.chicago-photo.com – lots of photos of Chicago & links to other sites
We could list thousands more, I suppose, but you get the idea. Typing “Chicago history” into Google will get more hits than you can imagine!