1974 10c Mineral Heritage: Petrified Wood
1974 10c Mineral Heritage
1974 10c Mineral Heritage: Tourmaline
1974 10c Mineral Heritage: Amethyst
1974 10c Mineral Heritage: Rhodochrosite
1992 29c Minerals: Azurite
1992 29c Minerals
1992 29c Minerals: Copper
1992 29c Minerals: Variscite
1992 29c Minerals: Wulfenite
1989 French So. & Antarctic Terr.
1969 Congo, Democratic Republic
2000 Korea, Dem. People's Republic
2002 Korea, Dem. People's Republic
Sierra Leone 1990 Diamond mining, S/S
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