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Effect of ultralow frequency signaling on blasting array current [microform] / by Kenneth E. Hjelmstad and Russell E. Griffin (Report of investigations ; 9479)

Effect of ultralow frequency signaling on blasting array current [microform] / by Kenneth E. Hjelmstad and Russell E. Griffin (Report of investigations ; 9479)
Microform図書
1993<YCA-I 28.23:9479>
National Diet Library
  • Author HeadingHjelmstad, Kenneth E Griffin, Russell E United Sta...

Ultra low frequency electromagnetic fire alarm system for underground mines / by K.E. Hjelmstad and W.H. Pomroy (Report of investigations ; 9377)

Ultra low frequency electromagnetic fire alarm system for underground mines / by K.E. Hjelmstad and W.H. Pomroy (Report of investigations ; 9377)
Microform図書
1991<YCA-I 28.23:9377>
National Diet Library
  • Author HeadingHjelmstad, Kenneth E Pomroy, William H United Stat...

Analysis of the oxidation of chalcopyrite, chalcocite, galena, pyrrhotite, marcasite, and arsenopyrite microform / by G.W. Reimers and K.E. Hjelmstad (Report of investigations ; 9118)

Analysis of the oxidation of chalcopyrite, chalcocite, galena, pyrrhotite, marcasite, and arsenopyrite microform / by G.W. Reimers and K.E. Hjelmstad (Report of investigations ; 9118)
Microform図書
1987<YCA-I 28.23:9118>
National Diet Library
  • Author HeadingReimers, G. W. (George W.) Hjelmstad, Kenneth E

Effect of clay stabilizers on permeability of clayey ore / by Kenneth E. Hjelmstad (Report of investigations ; 8902)

Effect of clay stabilizers on permeability of clayey ore / by Kenneth E. Hjelmstad (Report of investigations ; 8902)
Microform図書
1984<YCA-I 28.23:8902>
National Diet Library
  • Author HeadingHjelmstad, Kenneth E United States. Bureau of Mine...

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