| Michel Houde: (Security Markings on British Malaya, British Consular Post Office at Bangkok, Thomas Waghorn.) |
| Ralph E. Trimble: A site devoted to the study of re-entries on postage and revenue stamps of BNA, U.S.A. & the world. |
| Ian Kimmerly Stamps |
| Bill Longley Auctions |
| John Talman Stamps |
| Walsh eBook Catalogues |
| Hugo Deshaye (Philatelist) Inc. |
| Chris Green Stamps |
| Hollywood Canteen (Stamp Dept.) Edmund H. (Ted) Wright |
| Taylor Stamps Robert Taylor |
| Canada Stamp Finder Maxime Stephanie Herold |
| Durbano Stamp Company - PERFINS Patrick Durbano |
| GORFA Stamps Covers PRICED RIGHT Larry Grossman |
| Vincent Graves Greene Philatelic Research Foundation [VGGPRF] |
| Postal Heritage and Philately - Library and Archives Canada |
| The Stuart Rossiter Trust - "... a Charitable Trust supporting research and publication relating to the history of communication through postal systems of the world." |
| Smithsonian National Postal Museum |
| Canadian Stamp Dealers' Association |
| StampOnTheWeb – “… a straightforward tool allowing a direct link to the areas of specific interests of the visitor.” |
| EXPONET – “… is to provide a permanent presentation of high quality stamp and Philatelic exhibits …” |
| Fédération Internationale de Philatélie [FIP] |
| CSDA – National & Local Shows |
| APS - Events and Shows Calendar |
| American Association of Philatelic Exhibitors [AAPE] |
| retroReveal - “…web-based image processing algorithms designed to help people discover hidden content.” |
| Stamp Compare – “…is to make it easy to perfectly align two images and then "toggle" between them, to manually compare and identify any differences.” |
| PHILATELIC EXPERTS - “… the names and areas of specialisation of some 2000 individual stamp experts, mainly pre-2000, who have back stamped or hand signed postage stamps, or issued certificates.” |
| Stamp forgeries of the world – “…vision is to display all forgeries ever created next to a genuine stamp for easy comparison.” |
| APEX Certificate Archive - "... search and view the opinions of stamps and covers that the American Philatelic Expertizing Service has examined." |
| Stamp Printers - "A worldwide stamp production resource from 1840." |
| David Rumsey Historical Map Collection – “… focuses on 16th through 21st century maps of North and South America, as well as maps of the World, Asia, Africa, Europe, and Oceania.” And more. |
| Time and Calendars - Calendars, Chronologies, Eras, Calendar units, etc. |
| Perpetual Calendar - A helpful tool for the Postal Historian |
| Global Gazetteer |
| Preservation and Care of Philatelic Material |
| W.C. Burden: Small Queen CPV Project |