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tom.gressman@minrec.org
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Armenite from Wasen Alp, Valais, Switzerland
tom.gressman@minrec.org
1
Silver from Kongsberg, Buskerud, Norway
tom.gressman@minrec.org
5
Copper from Ontonagon County, Michigan, USA
tom.gressman@minrec.org
4
Silver from Hongda Mine, Shanxi, China
tom.gressman@minrec.org
4
Autunite from Governador Valadares, Minas Gerais, Brazil
tom.gressman@minrec.org
4
Gold from Eagle's Nest Mine, California, USA
tom.gressman@minrec.org
4
Bournonite from Potosí, Bolivia
tom.gressman@minrec.org
2