@article{358883,
      url = {http://library.usi.edu/record/358883},
      title = {U.S. population change, 1950-1970 [electronic resource].},
      publisher = {Maps.com,},
      recid = {358883},
      pages = {1 online resource (1 map)},
      address = {[S.l.] :},
      year = {1999},
}