Biblioteca SEGEMAR

Vista normal Vista MARC Vista ISBD

Durkin, John.

Vertical magnetic noise in the voice frequency band within and above coal mines / by John Durkin. - [Washington, D.C.] : U.S. Dept. of the Interior, Bureau of Mines, 1983. - 27 p. : ill. ; 28 cm. - Report of investigations ; 8828 . - Report of investigations (United States. Bureau of Mines) ; 8828. .

Bibliography: p. 21-22.

LCCN: 83600164

Subjects--Topical Terms:
Coal mines and mining--Communication systems.
Electromagnetic noise.
Voice frequency.

LC Class. No.: TN23 TN344 / .U43 no. 8828

Dewey Class. No.: 622 s 622

Gov. Doc. Class. No.: I 28.23:8828.