Into the unknown: the story of exploration / [prepared byNational Geographic Book Service]. - 1st ed. - Washington, D.C. : National Geographic Society, c1987. - 336 p. : ill. (some col.), maps ; 29 cm.

Includes index.

ISBN: 0870446959 (deluxe : alk. paper) : 0870446940 (alk. paper) :

LCCN: 87005525 //r88

Subjects--Topical Terms:
Discoveries (in geography).

Subjects--Index Terms: Discoveries (in geography).

LC Class. No.: G80 / .I58 1987

Dewey Class. No.: 910/.9