Gelijkaardige items: National Geographic :
- National Geographic : vol. 146, no. 1, July 1974 /
- National Geographic : vol. 146, no. 2, August 1974 /
- National Geographic : vol. 146, no. 3, September 1974 /
- National Geographic : vol. 146, no. 5, November 1974 /
- National Geographic : vol. 146, no. 6, December 1974 /
- National Geographic : vol. 145, no. 4, April 1974 /