Longwall roof support technology in the eighties :
a state-of-the-art report /
by Ernest A. Curth and Jeffrey M. Listak.

APA Citation

Curth, E. A., Listak, J. M. (1986). Longwall roof support technology in the eighties: a state-of-the-art report. Washington, D.C.: U.S. Dept. of the Interior, Bureau of Mines.

MLA Citation

Curth, Ernest A, and Jeffrey M Listak. Longwall Roof Support Technology In the Eighties: a State-of-the-art Report. Washington, D.C.: U.S. Dept. of the Interior, Bureau of Mines, 1986.

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