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Ultra low frequency electromagnetic fire alarm system for underground mines / by K.E. Hjelmstad and W.H. Pomroy.

by Hjelmstad, K. E | Pomroy, W. H | United States Department of the Interior. Bureau of Mines.

Material type: book Book; Format: print Publisher: [Washing, D.C.] : Bureau of Mines, U.S. Dept. of the Interior, 1991Availability: Items available for loan: Matheson Library [Call number: 622.82 H677] (1).

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Effect of ultralow frequency signaling on blasting array current / by Kenneth E. Hjelmstad and Russell E. Griffin.

by United States. Bureau of Mines | Hjelmstad, Kenneth E.

Material type: book Book; Format: print ; Literary form: Not fiction Publisher: Avondale, Md. : U.S. Dept. of the Interior, Bureau of Mines, 1993Availability: No items available Lost (1).

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The Matheson Library of Papua New Guinea University of Technology consists of a Bulolo University College Library, TFTC Library, Lae School of Nursing Library and SUSU campus in Chimbu.

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