@article{139930,
      recid = {139930},
      title = {Soda ash and sodium sulfate [microform].},
      publisher = {U.S. Dept. of the Interior, Bureau of Mines,},
      address = {Washington, D.C. :},
      pages = {v. :},
      note = {Title varies slightly.},
      url = {http://library.usi.edu/record/139930},
}