produced by the Cartographic Division, National Geographic Society ; Richard J. Darley, chief cartographer ; John F. Shupe, associate chief cartographer[National Geographic Society]1981
produced by the Cartographic Division, National Geographic Society ; Richard J. Darley, chief cartographer ; John F. Shupe, associate chief cartographer[National Geographic Society]1980
produced by the Cartographic Division, National Geographic Society ; William T. Peele, chief cartographer ; David W. Cook, assistant chief cartographer ; researched and compiled by George E. Stuart[National Geographic Society]c1972
compiled and drawn in the Cartographic Division of the National Geographic Society for the National geographic magazine ; Wellman Chamberlin, chief cartographer ; Athos D. Grazzini, associate chief cartographerNational Geographic Society1967