1993. National Geographic Society (U.S.). Cartographic Division. Includes tex and chronological chart. Includes text, ancillary maps of "Ice age vegetation 18,000 years BP" and "Greenhouse-effect vegetation zones... Washington, D.C. : National Geographic Society, 1993.
    
  
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      1922. National Geographic Society (U.S.). Cartographic Division. Scale 1:5,500,000 ; Lambert conformal conic projection with two parallels Insets: Guantanamo Bay, Cuba; ca. 1:400,000.--Porto Rico and the Virgin I... The Society.