Lignende værker: National Geographic :
- National Geographic : vol. 136, no. 1, July 1969 /
- National Geographic : vol. 136, no. 2, August 1969 /
- National Geographic : vol. 136, no. 3, September 1969 /
- National Geographic : vol. 136, no. 5, November 1969 /
- National Geographic : vol. 135, no. 4, April 1969 /
- National Geographic : vol. 120, no. 4, October 1961 /