Rāda: Angola - Pastmarkas (1970 - 1979) - 1 marka.
1971
The 5th Anniversary of the Regional Soil and Foundation Engineering Conference, Luanda
22. augusts SV: Neviens Lapas izmērs: 50 Dizains: José de Moura iegravēt: INCM Perforēšana: 13½
![[The 5th Anniversary of the Regional Soil and Foundation Engineering Conference, Luanda, veids KX]](https://www.stampworld.com/media/catalogue/Angola/Postage-stamps/KX-s.jpg)
