@article{198980,
      recid = {198980},
      author = {Dickinson, Kendell A.,},
      title = {A reconnaissance study of radon levels in soils developed  on the Upper Cretaceous Pierre Shale just above the Sharon  Springs Member in the Missouri River Valley in southeastern  South Dakota and northeastern Nebraska [microform] /},
      publisher = {U.S. Dept. of the Interior, Geological Survey :},
      address = {[Denver, CO] :},
      pages = {ii, 10 leaves :},
      year = {1992},
      note = {Distributed to depository libraries in microfiche.},
      url = {http://library.usi.edu/record/198980},
}