National geographic :  Index 1888-1988 / 
National Geographic Society. 
 - [Washington, D.C.] :  National Geographic Society,  1989. 
 - 1215 p. :  ill. (some col.) ;  27 cm. 
 - 031 (NLA) .
<br/><br/> 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.). 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopedia
<br/><br/><label>Universal Decimal Class. No.: </label>031 (NLA)