Muri Bhalissa: Angola - Bolol tal-posta (1970 - 1979) - 1 bolol.
1971
The 5th Anniversary of the Regional Soil and Foundation Engineering Conference, Luanda
22. August WM: Xejn Qies ta'karta: 50 Disinn: José de Moura Inċiżjoni: INCM Perforazzjoni: 13½
![[The 5th Anniversary of the Regional Soil and Foundation Engineering Conference, Luanda, Tip KX]](https://www.stampworld.com/media/catalogue/Angola/Postage-stamps/KX-s.jpg)
