Postage stamp collecting

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Federation Internationale Des Societes Aerophilateliques
The International Federation of Aerophilatelic Socities is an Astrophilately associations interested in aerophilately and astrophilately (air and space themes)

Space Topic Study Unit
One of the largest independent Astrophilately associations in the world

Gesellschaft der Weltall-Philatelisten
Site in German language of an Astrophilately associations interested in astrophilately

SOSSI - Scout Air & Space Mail
Section of the Astrophilately associations called Scouts on Stamps Society International site that lists Scout-related aerophilately and space philately

ASSS Home Page
The Astrophilately associations named Astro Space Stamp Society is dedicated to space-themed philately