@article{199896,
      note = {Cover title.},
      author = {Hemingway, Bruce S.},
      url = {http://library.usi.edu/record/199896},
      title = {On the Al₂SiO₅ triple point and the natural occurrence  of two Al₂SiO₅ polymorphs under the same P-T conditions  [microform] /},
      publisher = {U.S. Geological Survey ;},
      recid = {199896},
      pages = {13 leaves :},
      address = {Reston, VA :},
      year = {1992},
}