Ejemplares similares: National Geographic :
- National Geographic : vol. 132, no. 1, July 1967 /
- National Geographic : vol. 132, no. 2, August 1967 /
- National Geographic : vol. 132, no. 3, September 1967 /
- National Geographic : vol. 132, no. 4, October 1967 /
- National Geographic : vol. 132, no. 6, December 1967 /
- National Geographic : vol. 131, no. 5, May 1967 /