@article{199655,
      note = {Report 91-633-A is Documentation; 91-633-B is Diskette.},
      author = {Kitchen, N. E.},
      url = {http://library.usi.edu/record/199655},
      title = {Bouguer gravity maps, rock property data, and principal  facts for gravity data compiled for the Island of Puerto  Rico and vicinity [microform] /},
      publisher = {U.S. Dept. of the Interior, U.S. Geological Survey ;},
      recid = {199655},
      pages = {21 leaves :},
      address = {Menlo Park, Calif. :},
      year = {1991},
}