@article{217699,
      note = {Cover title.},
      author = {Chao, E. C. T.},
      url = {http://library.usi.edu/record/217699},
      title = {Origin and ages of mineralization of Bayan Obo, the  world's largest rare earth ore deposit, Inner Mongolia,  China [microform] /},
      publisher = {U.S. Dept. of the Interior, U.S. Geological Survey,},
      recid = {217699},
      pages = {9 p. :},
      address = {[Denver, Colo.?] :},
      year = {1990},
}