@article{65115,
      author = {Sinkankas, John.},
      url = {http://library.usi.edu/record/65115},
      title = {Gemstones of North America.},
      publisher = {Van Nostrand,},
      recid = {65115},
      pages = {xv, 675 p.},
      address = {New York :},
      year = {1959},
}