Preparation characteristics of coal from Butler County, Pa. /
by T.E. Gray and E.R. Palowitch.
APA Citation
Gray, T. E., Palowitch, E. R. (Eugene Robert). (1960). Preparation characteristics of coal from Butler County, Pa.. [Washington, D.C.]: U.S. Dept. of the Interior, Bureau of Mines.
MLA Citation
Gray, T. E, and Eugene R. (Eugene Robert) Palowitch. Preparation Characteristics of Coal From Butler County, Pa.. [Washington, D.C.]: U.S. Dept. of the Interior, Bureau of Mines, 1960.
Warning: These citations may not always be complete (especially for serials).