TY  - BOOK
ED  - National Geographic Society (U.S.).
TI  - Unlocking secrets of the unknown with National Geographic
U1  - 910/.9 20
PY  - 1993///
CY  - Washington, D.C.
PB  - The Society
KW  - National Geographic Society (U.S.)
KW  - Geography
KW  - Research
N1  - Includes index
ER  -