Podobne knjige/članki: National Geographic :
- National Geographic : vol. 135, no. 2, February 1969 /
- National Geographic : vol. 135, no. 3, March 1969 /
- National Geographic : vol. 135, no. 5, May 1969 /
- National Geographic : vol. 135, no. 6, June 1969 /
- National Geographic : vol. 135, no. 1, January 1969 /
- National Geographic : vol. 136, no. 4, October 1969 /