Longwall mining methods in some mines of the Middle Western states /
by Albert L. Toenges.

APA Citation

Toenges, A. L. (Albert Louis). (1936). Longwall mining methods in some mines of the Middle Western states. [Washington, D.C.]: U.S. Dept. of the Interior, Bureau of Mines.

MLA Citation

Toenges, Albert L. (Albert Louis), 1889-. Longwall Mining Methods In Some Mines of the Middle Western States. [Washington, D.C.]: U.S. Dept. of the Interior, Bureau of Mines, 1936.

Warning: These citations may not always be complete (especially for serials).