@article{139931,
      note = {Imprint varies: Washington, D.C., 19 -<Oct. 1995>; Reston,  Va., <Dec. 1995- >},
      url = {http://library.usi.edu/record/139931},
      title = {Marketable phosphate rock.},
      publisher = {U.S. Dept. of the Interior, Bureau of Mines,},
      recid = {139931},
      pages = {v. ;},
      address = {Washington, D.C. :},
}