Vertical magnetic noise in the voice frequency band within and above coal mines
By: by John Durkin.
Series: Report of investigations ;; 8828; Report of investigations (United States. Bureau of Mines) ;; 8828.
Publisher: U.S. Dept. of the Interior, Bureau of Mines
Published: 1983
Place of publication: [Washington, D.C.]
Language: eng
Number of pages: 27
Subjects: Coal mines and mining -- Communication systems.; Electromagnetic noise.; Voice frequency.
Notes: Bibliography: p. 21-22.