@article{239648,
      note = {Cover title.},
      author = {Campbell, Harry W.},
      url = {http://library.usi.edu/record/239648},
      title = {Procedure for making a mining claim density map from BLM  claim recordation digital data [microform] /},
      publisher = {U.S. Dept. of the Interior, U.S. Geological Survey,},
      recid = {239648},
      pages = {13 leaves ;},
      address = {[Menlo Park, CA] :},
      year = {1996},
}