Directionally controlled drilling to horizontally intercept selected strata, upper Freeport coalbed, Green County, Pa. /

Bibliographic Details

Main Authors:	Diamond, W. P. (William P.), Oyler, David C. (Author), Fields, Herbert H. (Author)
Corporate Author:	United States. Bureau of Mines
Format:	Government Document Book
Language:	English
Published:	[Washington] : Dept. of the Interior, Bureau of Mines, 1977.
Series:	Report of investigations (United States. Bureau of Mines) ; 8231.
Subjects:	Boring. Mine gases. Mine ventilation. Coal mines and mining.