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Cover for Us Dept of Geological Survey · Mining in the Dragoon Quadrangle of Cochise County, Arizona (Paperback Book) (2015)

Mining in the Dragoon Quadrangle... (2015)

Us Dept of Geological Survey

Cover for Us Dept of Geological Survey · Placer Gold Mining in Arizona (Paperback Book) (2015)

Placer Gold Mining in Arizona (2015)

Us Dept of Geological Survey

Cover for Us Dept of Geological Survey · Mining in the Jumbo Basin of Alaska (Paperback Book) (2015)

Mining in the Jumbo Basin of Alaska (2015)

Us Dept of Geological Survey

Cover for Us Dept of Geological Survey · The Rampart Placer Gold Region of Alaska (Paperback Book) (2015)

The Rampart Placer Gold Region o... (2015)

Us Dept of Geological Survey

Cover for Us Dept of Geological Survey · The Juneau Gold Belt of Alaska (Paperback Book) (2014)

The Juneau Gold Belt of Alaska (2014)

Us Dept of Geological Survey