Muri Bhalissa: L-Istati Uniti - Bolol tal-posta ta' l-ajru (1918 - 2012) - 2 bolol.
1972
The 100th Anniversary of the National Parks System
WM: Xejn Perforazzjoni: 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. August WM: Xejn Perforazzjoni: 11 x 10½
![[Winter Olympic Games - Sapporo, Japan, Tip BF]](https://www.stampworld.com/media/catalogue/United-States/Airmail-stamps/BF-s.jpg)
