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American Philatelic Society
With 55,000+ members in more than 110 countries, the APS is the largest, nonprofit society in the world for stamp collectors. It is supported entirely by membership dues, gifts, and the sale of its publications and services. Founded in 1886, the APS is now in its second century of service to stamp collectors and postal historians.

American Philatelic Foundation
The American Philatelic Foundation is a non-profit, 501-3C organization, serving the public now for thirty years. By calling our Los Angeles, California office directly, (310) 275-3256 we answer questions about stamp collecting. Office hours are 10am - 4pm Pacific Time. Our organization donates much of its time and material to hospitals and youth groups with a specific emphasis on young children who we hope to interest in the hobby of stamp collecting.
Our Director, Michael DuBasso has been acting director for thirty years. He is a knowledgeable philatelist and renowned appraiser in his field. Michael has written a definitive book on stamp collecting which was recently published.

The U.S. Philatelic Classics Society, Inc.
History of the U.S. Philatelic Classics Society
Advantages of Membership
Information on Membership
Index to recent Chronicle issues
Publications of the U.S.Philatelic Classics Society
New York Chapter of the U.S.Philatelic Classics Society

Universal Postal Union
The Universal Postal Union (UPU) works to stimulate the lasting development of efficient and accessible universal postal services of quality that facilitate communication between inhabitants.
The world's second oldest international organisation aims to guarantee the free circulation of postal items over a single postal territory composed of interconnected networks.
The UPU also encourages the adoption of fair common standards and technology, ensures interaction among stakeholders, promotes effective technical cooperation and responds to customers’ changing needs.
The Posts maintain the world’s largest physical distribution network with 660,000 post offices. These, in turn, provide modern products and services vital to the socio-economic development of any country.

The Postal History Society
Postal history is the study of material carried by, and related to, official, local or private mails. It illustrates routes, rates, markings, usages and other postal aspects, services, functions and activities related to the history of the development of Postal Services. Postmark collections - also called "marcophily" - demonstrate classifications and/or studies of postal markings related to official, local or private mails on covers and other postal items.

American First Day Cover Society
The American First Day Cover Society (AFDCS) is a volunteer non-profit and non-commerical organization serving the needs of First Day Cover collectors, cachetmakers, and dealers. Founded in 1955, the society has a membership of approximately 1,500 active first day cover collectors, including hundreds of collectors who design and manufacture their own cacheted FDCs.

American Topical Association
The American Topical Association (ATA) was founded in 1949 and is now the largest philatelic society devoted specifically to topical stamp collecting. Serving members worldwide, we pride ourselves in being the best source of information, fellowship and authority in this field.

OFFICIAL HOME PAGE OF STAMPS ON STAMPS COLLECTORS CLUB (SOSCC)
The topic of stamps on stamps is one of the most diverse of all topicals. Ever since Sir Rowland Hill first advocated the use of prepaid pieces of paper to be adhered to letters to expedite their delivery, people have been fascinated by the postage stamp. It should come as no surprise, then, that the postage stamp is being used as a stamp motif, and that topical collecting of stamps on stamps is popular. The topic of stamps on stamps is an interesting one in that it covers many different areas and avenues while still being true to the stamp topic.