TY  - BOOK
TI  - Why on earth?
SN  - 0-87044-701-7
U1  - Ref. 500.76 W629 1988 
PY  - 1988///
CY  - Washington, D.C.
PB  - The National Geographic Society
KW  - Science
KW  - Questions and answers
N1  - Includes index
ER  -