@article{184715,
      recid = {184715},
      author = {Hjelmstad, Kenneth E. and Griffin, Russell E.},
      title = {Effect of ultralow frequency signaling on blasting array  current [microform] /},
      publisher = {U.S. Dept. of the Interior, Bureau of Mines,},
      address = {Washington, D.C. :},
      pages = {7 p. :},
      year = {1993},
      note = {Distributed to depository libraries in microfiche.},
      url = {http://library.usi.edu/record/184715},
}