Friability of Alabama coals /
by Ellis S. Hertzog and James R. Cudworth.
APA Citation
Hertzog, E. S., Cudworth, J. R. (1938). Friability of Alabama coals. [Washington, D.C.]: United States Bureau of Mines.
MLA Citation
Hertzog, Ellis S, and James R Cudworth. Friability of Alabama Coals. [Washington, D.C.]: United States Bureau of Mines, 1938.
Warning: These citations may not always be complete (especially for serials).