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Oregon goldsilver & gems maps then and nowgoldsilver agate apache tears bloodstone thunder eggs tourmaline jadeMapĐược phát hành 2000
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Northwest gem trailsa field guide for the gem hunter mineral collector and tourist covering both popular and little known areas of Oregon Washington Idaho British ColumbiaBookBằng Dake, H. C. (Henry Carl), 1896-1969-
Được phát hành 1962 -
Western gem hunters atlasrock locations from California to the Dakotas and British Columbia to TexasBookBằng Johnson, Cy (Humphrey Cyril), 1905-
Được phát hành 1971 -
Idaho gold & gems maps then and nowgoldsilver agate topaz corundum quartz garnet jasper opal petrified wood feldsparMapĐược phát hành 2000
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NW gem fields and ghost town atlascartographic materialBằng Johnson, Robert Neil
Được phát hành 1980