Ditunjukkan sekarang: Amerika Syarikat - Setem-setem mel udara (1970 - 1979) - 2 Setem-setem.
1972
The 100th Anniversary of the National Parks System
WM: Tiada Corak: Paul Rabut Perforasi: 11
![[The 100th Anniversary of the National Parks System, jenis BE]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/BE-s.jpg)
1972
Winter Olympic Games - Sapporo, Japan
17. August WM: Tiada Perforasi: 11 x 10½
![[Winter Olympic Games - Sapporo, Japan, jenis BF]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/BF-s.jpg)
