@article{196647,
      recid = {196647},
      author = {Dickinson, Kendell A.,},
      title = {Preliminary chemical and mineralogical analyses of the  major volcanic ash beds in the Oligocene Brule Formation,  northwestern Nebraska [microform] /},
      publisher = {U.S. Dept. of Interior, U.S. Geological Survey ;},
      address = {[Reston, Va.] :},
      pages = {1 v.},
      year = {1994},
      note = {Cover title.},
      url = {http://library.usi.edu/record/196647},
}