@article{199846,
      note = {Cover title.},
      author = {Long, Keith R.},
      url = {http://library.usi.edu/record/199846},
      title = {Lacustrine manganese a supplement to U.S. Geological  Survey bulletin 1693 / [microform] :},
      publisher = {U.S. Geological Survey ;},
      recid = {199846},
      pages = {12 leaves :},
      address = {Menlo Park, CA :},
      year = {1992},
}