|  Fort Bliss Centennial | Nov. 5, 1948 | Scott No.: 976
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|  Echo 1 - Communications For Peace | December 15, 1960 | Scott No.: 1173
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|  Project Mercury - U.S. Man In Space | February 20, 1962 | Scott No.: 1193
 
 Issued to commemorate the orbital flight of John Glenn, it was secretly held at post offices until his successful splashdown.
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 Robert H. Goddard | October 4, 1964 | Scott No.: C69
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 Space Walk & Gemini Capsule | Sept. 29, 1967 | Scott No.: 1331/2
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 Apollo 8 May 5, 1969
 Scott No.: 1371
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 First Man On The Moon September 9, 1969
 Scott No.: C76
 
 A die for this issue was flown to the Moon on Apollo 11.
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 United States In Space - A Decade Of Space Achievement, August 2, 1971, Scott No.: 1434/35 | | 
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 Skylab May 14, 1974
 Scott No.: 1529
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 Pioneer - Jupiter February 28, 1975
 Scott No.: 1556
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 Mariner 10 - Venus/Mercury April 4, 1975
 Scott No.: 1557
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 Apollo-Soyuz Test Project July 15, 1975
 Scott No.: 1569/70
 
 The top issue was a U.S. design, the bottom was Soviet. An identical set was issued in the USSR with cyrillic text.
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 Viking Mission To Mars July 20, 1978
 Scott No.: 1759
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 Space Achievement, May 21, 1981, Scott No.: 1912-1919 | | 
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 Universal Postal Congress November 28, 1985
 Scott No.: C122/4/5
 
 The theme of these four issues was potential mail delivery methods for the future.
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 Apollo 11 20th Anniversary July 20, 1989
 Scott No.: 2419
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 Future Shuttle May 22, 1991
 Scott No.: 2543
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 Space Exploration October 1, 1991
 Scott No.: 2568-77
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 International Cooperation In Space May 29, 1992
 Scott No.: 2631-4
 
 As with the Apollo- Soyuz issue, these stamps were also released in Russia (in a slightly larger format and with cyrillic text).
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 Theodore von Karman August 31, 1992
 Scott No.: 2699
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 Apollo 11 25th Anniversary July 20, 1994
 Scott No.: 2841
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 Apollo 11 25th Anniversary July 20, 1994
 Scott No.: 2842
 
 500,000 of these were flown in space aboard Endeavour in August 1994.
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 Challenger Priority Mail June 22, 1995
 Scott No.: 2544
 
 Issued twice, in 1995 and then in 1996 with minor color changes.
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 Endeavour Express Mail August 4, 1995
 Scott No.: 2544a
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 Mars Pathfinder, December 10, 1997, Scott No.: 3178 | | Third U.S. issue to incorporate hidden text — "Mars Pathfinder, July 4, 1997" and the letters "USPS" — not visible to the naked eye. 
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 Shuttle Landing Priority Mail November 9, 1998
 Scott No.: 3261
 
 Hidden text lists each orbiter's name. Endeavour is misspelled.
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 Shuttle Landing Express Mail November 19, 1998
 Scott No.: 3262
 
 Hidden text lists each orbiter's name. Endeavour is misspelled.
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 U.S. Launches Satellites May 26, 1999
 Scott No.: 3187d
 
 Issued as part of the 1950's set of the "Celebrate The Century" program.
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 Man Walks On The Moon September 17, 1999
 Scott No.: 3188c
 
 Issued as part of the 1960's set of the "Celebrate The Century" program.
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 Pioneer 10 November 18, 1999
 Scott No.: 3189i
 
 Issued as part of the 1970's set of the "Celebrate The Century" program.
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 Space Shuttle Program January 12, 2000
 Scott No.: 3190a
 
 Issued as part of the 1980's set of the "Celebrate The Century" program.
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 Edwin Powell Hubble, Date: April 10, 2000, Scott No.: 3384-88 | | 
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 Return To Space May 2, 2000
 Scott No.: 3191h
 
 Issued as part of the 1990's set of the "Celebrate The Century" program.
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 Space Achievement, Date: July 7-11, 2000, Scott No.: 3409-13
 15 different issues including the nation's first pentagonal and round stamps as well as the first holographic issue.
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