Home › Authors › U. S. Dept Geological Survey 👤 U. S. Dept Geological Survey 4 books Books by U. S. Dept Geological Survey Mining in the Jumbo Basin of A Mining in the Jumbo Basin of Alaska 2015 Placer Gold Mining in Arizona Placer Gold Mining in Arizona 2015 Rampart Placer Gold Region of Rampart Placer Gold Region of Alaska 2015 Juneau Gold Belt of Alaska Juneau Gold Belt of Alaska 2014