@article{229403,
      recid = {229403},
      author = {Marvin, Richard F.},
      title = {Radiometric ages of igneous rocks from Pima, Santa Cruz,  and Cochise Counties, southeastern Arizona,},
      publisher = {U.S. Govt. Print. Off.,},
      address = {Washington,},
      pages = {iii, 27 p. :},
      year = {1973},
      url = {http://library.usi.edu/record/229403},
}