The 1st Portuguese-Spanish-American Congress for Economic Geology 1971
Most látható: Portugália - Postaköltség bélyegek - 1971 - The 1st Portuguese-Spanish-American Congress for Economic Geology - 4 bélyegek.
1971
The 1st Portuguese-Spanish-American Congress for Economic Geology
24. szeptember Vj: Senki Tervezte: Serviços Artísticos dos CTT Metszet: Casa da Moeda Fogazat: 12
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