.....AND, if anyone can figure out how to find an old map of Villa Park, Lombard, or Glen Ellyn in Illinois, I would really appreciate it. I can't find out how to find them on the Library of Congress web site.
I just did a search for sanborne maps for pennsylvania and got Into Penn State's library. They had Pennsylvania maps readily available. Allentown maps went back to 1885. Just a quick search to find that map. No pass word needed.