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Source:
Colnect
Issued by:
Portugal
Function:
postage
Date:
9/24
/
1971
Issue:
Economic Geology Congress
Denom:
3.50e
Color:
multicolored
Design type:
minerals
(1971 Portugal)
Design:
beryllium
Watermark:
unwmk
Perf:
12
Catalog value:
Prev:
2.50e d=arsenopyrite
Next:
6.50e d=chalcopyrite (1971)
External links:
Colnect 64193-..onomic_Geology
