Sedaj prikazano: Združene države - Znamke letalske pošte (1970 - 1979) - 2 znamke.
1972
The 100th Anniversary of the National Parks System
WM: Nič Perforacija: 11
![[The 100th Anniversary of the National Parks System, tip BE]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/BE-s.jpg)
1972
Winter Olympic Games - Sapporo, Japan
17. avgust WM: Nič Perforacija: 11 x 10½
![[Winter Olympic Games - Sapporo, Japan, tip BF]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/BF-s.jpg)
