The 1st Portuguese-Spanish-American Congress for Economic Geology 1971
Now showing: Portugal - Postage stamps - 1971 - The 1st Portuguese-Spanish-American Congress for Economic Geology - 4 stamps.
1971
The 1st Portuguese-Spanish-American Congress for Economic Geology
24. September WM: None Design: Serviços Artísticos dos CTT Engraving: Casa da Moeda Perforation: 12
![[The 1st Portuguese-Spanish-American Congress for Economic Geology, type OR]](https://www.stampworld.com/media/catalogue/Portugal/Postage-stamps/OR-s.jpg)
![[The 1st Portuguese-Spanish-American Congress for Economic Geology, type OS]](https://www.stampworld.com/media/catalogue/Portugal/Postage-stamps/OS-s.jpg)
![[The 1st Portuguese-Spanish-American Congress for Economic Geology, type OT]](https://www.stampworld.com/media/catalogue/Portugal/Postage-stamps/OT-s.jpg)
![[The 1st Portuguese-Spanish-American Congress for Economic Geology, type OU]](https://www.stampworld.com/media/catalogue/Portugal/Postage-stamps/OU-s.jpg)
