• publisher: Washington : [U.S. Geological Survey]
  • creator: Geological Survey (U.S.)
  • Keyword: Mines and mineral resources. Geology, Economic.
  • years: 1921.
  • pages: 2 v. :
  • language: eng
  • lccn: s
  • notes: At head of title: Department of the Interior, John Barton Payne, secretary. United States Geological Survey, George Otis Smith, director.
  • download: pdf file