Results 91 - 92 of 92

• Roof Fall Entrapment: Eyewitness Account by Dave Garry
  1/1/1992 - Training materials, Videos and multimedia
  A videotaped interview with a miner helper who witnessed a roof fall that convered the continuous mining machine. An instructor's guide is included to help you use this video as part of an effective training session.
• Geologic Factors Causing Roof Instability and Methane Emission Problems: The Lower Kittanning Coalbed, Cambria County, Pa
  1/1/1973 - Reports of Investigations
  A geologic study of Mines 32 and 33 in Cambria County, Pennsylvania, was conducted as part of a methane control research program.