@article{197431,
      recid = {197431},
      author = {Ludwig, K. R.},
      title = {UISO: a program for calculation of ℗©°Th-℗©♯U-℗©⁸U  isochron ages [microform] /},
      publisher = {U.S. Dept. of the Interior, U.S. Geological Survey :},
      address = {[Denver, CO] :},
      pages = {9 leaves ;},
      year = {1993},
      note = {Distributed to depository libraries in microfiche.},
      url = {http://library.usi.edu/record/197431},
}