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
1978 Tristan da Cunha
1975 Laos
1994 Azerbaijan
1969 Congo, Democratic Republic
1991-97 Namibia
1983 Zaire
2012 Israel
1989 Brazil
1963 Russia
1968 Russia
1971 Russia
Sierra Leone 1990 Diamond mining, S/S
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