@article{257907,
      note = {Cover title.},
      author = {Wilburn, D. R. and Langer, William H.},
      url = {http://library.usi.edu/record/257907},
      title = {Preliminary report on aggregate use and permitting along  the Colorado Front Range [microform] /},
      publisher = {U.S. Dept. of the Interior, U.S. Geological Survey,},
      recid = {257907},
      pages = {22 leaves :},
      address = {Denver, Colo. :},
      year = {2000},
}