Underground Gasification of Coal: Second Experiment in Preparing a Path Through a Coalbed by Hydraulic Fracturing, Issues 5807-5813
Arden D. Fugate Β· Edward G. King Β· John B. Gayle Β· K. K. Kershner Β· Frederick W. Hoertel Β· Lloyd Harold Banning Β· William H. Eddy Β· William W. Weller Β· Andrew A. Cochran
1961λ 1μ Β· U.S. Department of the Interior. Bureau of Mines