Estimate of known recoverable reserves of coking coal in Armstrong County, Pa. /
by James J. Dowd ... [et al.

APA Citation

Dowd, J. J., United States. Bureau of Mines. (1951). Estimate of known recoverable reserves of coking coal in Armstrong County, Pa.. [Washington, DC]: U.S. Dept. of the Interior, Bureau of Mines.

MLA Citation

Dowd, James J, and United States. Bureau of Mines. Estimate of Known Recoverable Reserves of Coking Coal In Armstrong County, Pa.. [Washington, DC]: U.S. Dept. of the Interior, Bureau of Mines, 1951.