@article{1484636,
      note = {"Base map: Puerto Rico e Islas Limitrofes, 1:220,000,  1950".},
      url = {http://digitallibrary.un.org/record/1484636},
      title = {Puerto Rico medical facilities [cartographic material]},
      publisher = {UN,},
      recid = {1484636},
      pages = {1 map ;},
      address = {[New York] :. 1951-09},
      year = {1951},
      month = {Sep},
}