National geographic index, 1888-1988.
- [Washington, D.C.] : National Geographic Society, 1989.
- 1215 p. : ill. (some col.) ; 27 cm.
Accompanied by "Maps of the United States and the world and cartography at the National Geographic Society, 1888-1988" (1 v. (unpaged) : 2 folded col. maps ; 26 cm.).