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Local Clubs:

Butler County Philatelic Society - LINK

Philatelic Society of Pittsburgh - LINK

(Inter)National Clubs/Associations:

American Philatelic Society - LINK

Australian Philatelic Federation - LINK

Israel Philatelic Federation - LINK

New Zealand Philatelic Federation - LINK

Smithsonian National Postal Museum - LINK

The Ebony Society of Philatelic Events and Reflections (ESPER) - LINK

Helpful Resources:

Collectors Club of Chicago - LINK

Colnect - LINK

HipStamp - LINK

International Stamp News - LINK

Linn's Stamp News - LINK

Stamp News Now - LINK

United States Postal Service - LINK

Forums & Discussion:

Stamp Community Forum - LINK

Internet Stamp Clubs:

International Society of Worldwide Stamp Collectors - LINK

StampoRama - LINK

Virtual Stamp Club - LINK