Resources
Illinois Postal History Society maintains a resources list for researchers studying Illinois postal history.
Major Bibliographic Resources
Illinois Postal Historian
Scans. photocopies and interlibrary loan of Illinois Postal Historian back-issues are offered as a fee-based service from:
American Philatelic Research Library (APRL)
http://stamps.org/Library-Services
Illinois Clubs
Chicago Philatelic Society
Collectors' Club of Chicago
http://www.collectorsclubchicago.org/
Rockford Stamp Club
http://www.rockfordstampclub.org/
Champaign-Urbana Stamp Club
Illinois Dealers and Associations
Rasdale
Stamp King
Midwest Stamp Dealers Association
Midwest Postal History Societies
Wisconsin Postal History Society page at the Wisconsin Federation of Stamp Clubs
http://www.wfscstamps.org/Clubs/WisconsinPostalHistory/
Missouri Postal History Society
http://www.missouripostalhistory.org/index.htm
MoPhil.org St. Louis and Area Philately
Peninsular State Philatelic Society