LIBROS DEL AUTOR: douglas l graeme

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  • Forgotten Caves of Bisbee, Arizona
    Douglas L. Graeme / Richard Wiliam Graeme IV / Richard William Graeme III
    During the last part of the 19th century miners at the booming mining camp at Bisbee in the Arizona Territory began finding natural caves. These caverns were more than the typical calcite and aragonite filled openings stained by iron and manganese oxides. These caverns contained substantial amounts of malachite, azurite, rosasite and even cuprite. As a result the caverns were a...
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