פריטים דומים: National Geographic :
- National Geographic : vol. 178, no. 1, July 1990 /
- National Geographic : vol. 178, no. 2, August 1990 /
- National Geographic : vol. 178, no. 3, September 1990 /
- National Geographic : vol. 178, no. 4, October 1990 /
- National Geographic : vol. 178, no. 6, December 1990 /
- National Geographic : vol. 177, no. 5, May 1990 /