Antzeko izenburuak: National Geographic :
- National Geographic : vol. 177, no. 2, February 1990 /
- National Geographic : vol. 177, no. 3, March 1990 /
- National Geographic : vol. 177, no. 5, May 1990 /
- National Geographic : vol. 177, no. 6, June 1990 /
- National Geographic : vol. 177, no. 1, January 1990 /
- National Geographic : vol. 178, no. 4, October 1990 /