Documenti analoghi: National Geographic :
- National Geographic : vol. 120, no. 1, July 1961 /
- National Geographic : vol. 120, no. 5, November 1961 /
- National Geographic : vol. 119, no. 4, April 1961 /
- National Geographic : vol. 122, no. 4, October 1962 /
- National Geographic : vol. 124, no. 4, October 1963 /
- National Geographic : vol. 126, no. 4, October 1964 /