Economic Geology Congress issue of Portugal
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Short desc: Economic Geology Congress
Issuer: Portugal Date: 9/24/1971 Occasion: unset Consists of 4 stamps: (See stamps as list) 1e d=wolframite 2.50e d=arsenopyrite 3.50e d=beryllium 6.50e d=chalcopyrite (1971) All are dt=minerals (1971 Portugal) perf=12 Record of changes |
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