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 · K. K. Kershner · John B. Gayle · Frederick W. Hoertel · Lloyd Harold Banning · William W. Weller · William H. Eddy · Andrew A. Cochran
ม.ค. 1961 · U.S. Department of the Interior. Bureau of Mines