American Philatelic Research Library Click Here

American Philatelic Society Click Here

British North America Philatelic Society Click Here

British Library (Philatelic Collections)  Click Here

Canadian Philatelic Society of  Great Britain Click Here

Canadian Postal Archives  Click Here

Canadian Postal Museum Click Here  

Canadian Stamp Auctions (Auction analysis)  Click Here

EFO (Errors, Freaks & Oddities) Collectors Club  Click Here

Postal History Organization  Click Here

Postal History Society Click Here

Postal History Society of Canada Click Here

Royal Philatelic Society of Canada Click Here

Smithsonian Institution  Click Here

United States Philatelic Classics Society  Click Here

Vincent Graves Greene Foundation (BNA Expertizers)   Click Here

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