• American Philatelic Society
• American Association of Philatelic Exhibitors
• American Topical Association
• United States Stamp Society
• National Postal Museum
• Global Philatelic Library
• HubPages: Stamp Collecting Hubs
• Institute for Analytical Philately
• Swedish Tiger Stamps
• World Stamp Show NY 2016
• Home Advisor - Stamp Collecting Tips
• Stamp Collecting for All Occasions
• StampSmarter
• The History of the Postcard (thanks to Ashley in Maine for this link)

Friends

• Local Area Stamp Clubs
• Omaha Philatelic Society
• Mound City Stamp Club
• Missouri Philately (MoPhil)
• Lincoln (NE) Stamp Club
• Wichita Stamp Club
• Oklahoma City Stamp Club