@article{196644,
      recid = {196644},
      author = {Herring, J. R.},
      title = {Methane, carbon dioxide, oxygen, and nitrogen in soil gas  overlying coal beds of the Upper Cretaceous Fruitland  Formation in the San Juan Basin, La Plata County,  southwestern Colorado [microform] /},
      publisher = {U.S. Dept. of the Interior, U.S. Geological Survey ;},
      address = {[Denver, Colo.?] :},
      pages = {9, [2] leaves, [1] leaf of plates :},
      year = {1994},
      note = {Cover title.},
      url = {http://library.usi.edu/record/196644},
}