Organizations, Members and References

• APS - American Philatelic Society
• APRL - American Philatelic Research Library
• CZSG - Canal Zone Study Group

• COLOMBIA POSTAL HISTORY 1886 - 1899 Philatelic Exhibit by Jim Cross
• COLOMBIA - THE UNKNOWN WAR "THE 1000 DAYS" Philatelic Exhibit by Jim Cross
• Panama Stamps by Patrick Lamastus
• Panama's Flat Arch Stamp
• SCADTA Postal Stationery Philatelic Exhibit by Jerry Kasper

• Stanley Gibbons
• UPAEP the Postal Union of the Americas, Spain and Portugal, showing stamps and postal history relating to this organization as well as much useful information.
• Why Collect Colombia
• Why Collect Panama

• Juan Santa Maria sale of Classic Colombia. This catalog features the scholarship of Dieter Bortfeldt. At present it is the single most important source on classic Colombia.
• The "Esmeralda" Collection of Colombian States, March 21, 2009, Investphila S.A.
• The "Esmeralda" Collection of Colombia, March 21, 2009, Investphila S.A.
• Deborah Friedman Collection of Colombian Airmail, November 13-15, 2007, Cherrystone Auctions
• Eugenio Gebauer International Large-Gold Collection of SCADTA, May, 2003, Corinphila Auction 136

• Colombia & Panama Auctions Project compiled by Robert L. Mitchell, 2003.

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Last Updated March 6, 2010