Сега показвам: Съединените Щати - Въздушна поща марки (1970 - 1979) - 2 марки.
1972
The 100th Anniversary of the National Parks System
воден знак: Никой дизайн: Paul Rabut Пробиване: 11
![[The 100th Anniversary of the National Parks System, тип BE]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/BE-s.jpg)
1972
Winter Olympic Games - Sapporo, Japan
17. Август воден знак: Никой Пробиване: 11 x 10½
![[Winter Olympic Games - Sapporo, Japan, тип BF]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/BF-s.jpg)
