Robert E. Gilka
Cartographer/Cartography by 5
 | National Geographic (January 1983) | Magazine |
 | National Geographic (March 1983) | Magazine |
 | National Geographic (April 1983) | Magazine |
 | National Geographic (May 1983) | Magazine |
 | National Geographic (June 1983) | Magazine |
Cover photo 1
 | National Geographic (July 1983) | Magazine |