![](https://www.americanairmailsociety.org/wp-content/uploads/2018/08/C127.jpg) | October 12, 1990
45¢ Multicolored
Tropical Coast
Scott #C127 |
![](https://www.americanairmailsociety.org/wp-content/uploads/2018/08/C128.jpg) | April 27, 1991
50¢ Multicolored
Harriet Quimby
Scott #C128 |
![](https://www.americanairmailsociety.org/wp-content/uploads/2018/08/C129.jpg) | May 17, 1991
40¢ Multicolored
William T. Piper
Scott #C129 |
![](https://www.americanairmailsociety.org/wp-content/uploads/2018/08/C130.jpg) | June 21, 1991
50¢ Multicolored
Antarctic Treaty
Scott #C130 |
![](https://www.americanairmailsociety.org/wp-content/uploads/2018/08/C131.jpg) | October 12, 1991
50¢ Multicolored
Bering Land Bridge
Scott #C131 |
![](https://www.americanairmailsociety.org/wp-content/uploads/2018/08/C132.jpg) | 1993
40¢ Multicolored
William T. Piper
Scott #C132 |
![](https://www.americanairmailsociety.org/wp-content/uploads/2018/08/C133.jpg) | May 12, 1999
48¢ Multicolored
Niagara Falls
Scott #C133 |
![](https://www.americanairmailsociety.org/wp-content/uploads/2018/08/C134.jpg) | July 30, 1999
40¢ Multicolored
Rio Grande
Scott #C134 |