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