Doc.No. Volume Publisher Year
07793 Vol.173 National Geographic Society, Washington 1988
05279 Vol.183 National Geographic Society, Washington 1993
05278 Vol.182 National Geographic Society, Washington 1992
05277 Vol.181 National Geographic Society, Washington 1992
04564 Vol.180 National Geographic Society, Washington 1991
04563 Vol.179 National Geographic Society, Washington 1991
04562 Vol.178 National Geographic Society, Washington 1990
04561 Vol.177 National Geographic Society, Washington 1990
04560 Vol.176 National Geographic Society, Washington 1989
04559 Vol.175 National Geographic Society, Washington 1989
03824 Vol.171 National Geographic Society, Washington 1987
03822 Vol.172 National Geographic Society, Washington 1987
03821 Vol.174 National Geographic Society, Washington 1988