Ultra low frequency electromagnetic fire alarm system for underground mines /
by K.E. Hjelmstad and W.H. Pomroy.
- Washington, D.C. (2401 E St., N.W., MS #9800, Washington 20241-0001) : U.S. Dept. of the Interior, Bureau of Mines, 1991.
- 11 p. : ill. ; 28 cm.
- Report of investigations / United States Department of the Interior, Bureau of Mines ; 9377 .
- Report of investigations (United States. Bureau of Mines) ; 9377. .
Includes bibliographical references (p. 11).
91010026
Mine fires--Prevention and control. Fire alarms. ELF electromagnetic fields.