• publisher: Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines
  • creator: Diamond, W. P. (William P.)
  • Keyword: Coal mines and mining United States Safety measures. Boring. Coal Geology United States. Methane.
  • years: [1982]
  • pages: 24 p. :
  • class: TN295
  • download: pdf file