@article{198436,
      note = {"Supersedes Open-file report 91-507."},
      author = {Blackwell, Cassandra D.},
      url = {http://library.usi.edu/record/198436},
      title = {Directory of assistance centers of the National Water Data  Exchange (NAWDEX) [microform] /},
      publisher = {U.S. Dept. of the Interior, U.S. Geological Survey ;},
      recid = {198436},
      pages = {iv, 40 p. ;},
      address = {Reston, Va. :},
      year = {1993},
}