INTERPHIL
Encyclopedia
INTERPHIL, or the Seventh International Philatelic Exhibition, was the seventh decennial philatelic exhibition for the United States held under the auspices of the
Fédération Internationale de Philatélie
Fédération Internationale de Philatélie
The Fédération Internationale de Philatélie was founded on June 18, 1926 and is the world federation for philately based in Zürich, Switzerland.- Aims :The primary aims of the FIP are:*To promote stamp collecting and philately....

 (FIP). It was held in Philadelphia, Pennsylvania
Philadelphia, Pennsylvania
Philadelphia is the largest city in the Commonwealth of Pennsylvania and the county seat of Philadelphia County, with which it is coterminous. The city is located in the Northeastern United States along the Delaware and Schuylkill rivers. It is the fifth-most-populous city in the United States,...

 from May 29 to June 6, 1976.

The United States Postal Service
United States Postal Service
The United States Postal Service is an independent agency of the United States government responsible for providing postal service in the United States...

issued commemorative stamps and a mini sheet in honor of the convention.
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