I'm looking for residential Chicago phone directories from the 1930s, 1950s and 1960s. Can you tell me where I can find this information? I am no longer in the city, but have a lot of numbers I would love to find for old time's sake. Does this information come in CD-ROM? If so, does anyone have a link that I can go to and how much do these costs? Are they on separate CD per decade? Any help would be appreciated. Thanx very much!