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October 12, 1990
45¢ Multicolored
Tropical Coast
Scott #C127
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April 27, 1991
50¢ Multicolored
Harriet Quimby
Scott #C128
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May 17, 1991
40¢ Multicolored
William T. Piper
Scott #C129
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June 21, 1991
50¢ Multicolored
Antartic Treaty
Scott #C130
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October 12, 1991
50¢ Multicolored
Bering Land Bridge
Scott #C131
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1993
40¢ Multicolored
William T. Piper
Scott #C132
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May 12, 1999
48¢ Multicolored
Niagra Falls
Scott #C133
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July 30, 1999
40¢ Multicolored
Rio Grande
Scott #C134
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