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Date of Issue - October 1, 1991
Place of Issue - Pasadena, California, home of the Jet Propulsion Laboratory.

On October 1st, 1991 the U.S. Postal Service issued a booket of 10 different setenent space stamps, (two horizontal strips of five stamps joined together vertically and horizontally). Each stamp had a face value of 29 cents.

The stamps were issued for National Stamp Collecting Month and commemorated the successful exploration of the 8 of the 9 planets in our Solar System, plus the Earth's satellite, and the Moon by U.S. spacecrafts.

The themes are:

#2568: Planet Mercury/Mariner 10 Spacecraft.
#2569: Planet Venus/Mariner 2 Spacecraft.
#2570: Planet Earth/Landsat Spacecraft.
#2571: Planet Earth's Moon/Lunar Orbiter Spacecraft.
#2572: Planet Mars/Viking Orbiter Spacecraft.
#2573: Planet Jupiter/Pioneer 11 Spacecraft.
#2574: Planet Saturn/Voyager 2 Spacecraft.
#2575: Planet Uranus/Voyager 2 Spacecraft.
#2576: Planet Neptune/Voyager 2 Spacecraft.
#2577: Planet Pluto/Not yet Explored

United States Space Stamps