@article{119704,
      note = {Issued in portfolio (28 cm.) with 7 folded maps in  pocket.},
      author = {Spencer, Frank Darwyn,},
      url = {http://library.usi.edu/record/119704},
      title = {Coal geology and coal, oil, and gas resources of the Erie  and Frederick Quadrangles, Boulder and Weld counties,  Colorado /},
      publisher = {U.S. G.P.O.,},
      recid = {119704},
      pages = {v, 50 p. :},
      address = {Washington :},
      year = {1986},
}