@article{160158,
      author = {Cunningham, Charles G.},
      url = {http://library.usi.edu/record/160158},
      title = {Ages of selected intrusive rocks and associated ore  deposits in the Colorado Mineral Belt /},
      publisher = {U.S. G.P.O.,},
      recid = {160158},
      pages = {iii, 31 p. :},
      address = {Washington :},
      year = {1994},
}