Societies

• American First Day Cover Society
• American Philatelic Congress
• American Philatelic Society
• Auxiliary Markings Club
• Carriers and Locals Society
• Christmas Seal & Charity Stamp Society
• Cinderella Stamp Club
• Collector's Club of New York
• FIP Postal Stationery Commission
• Official Seals
• Philatelic Computing Study Group
• Postal Label Society
• Royal Philatelic Society of Canada
• Royal Philatelic Society of London
• United Postal Stationery Society
• United States Philatelic Classics Society
• United States Stamp Society

Library

• American Philatelic Research Library

Organization

• Local Mail Posts in the U.S. - Bibliography (Smithsonian)
• Story of Canadian Christmas Seals

Government

• Bureau of Engraving and Printing
• History of the Post Office
• National Postal Museum
• U.S. Postal Service

Miscellaneous

• Care of Philatelic Materials
• Digital Philatelic Workshop
• History of Stamp Collecting
• Lawrence LeBell's Boyd's Exhibit
• Philatelic Bibliopole
• Proof & Essay Museum
• San Diego Exhibiting Workshop
• Stamp Forgery Links
• Virtual Perpetual Calendar

Software