• publisher: Pittsburgh, Pa. : U.S. Dept. of the Interior, Bureau of Mines
  • creator: Sames, Gary P Laird, Robert B
  • contributor: Laird, Robert B.
  • Keyword: Ground control (Mining) Coal Geology West (U.S.)
  • years: 1988.
  • pages: ii, 30 p. :
  • language: eng
  • lccn: s
  • class: TN295 TN288
  • download: pdf file