TY  - BOOK
AU  - DONALD CLARKE
TI  - HOW IT WORKS. VOLUME 6
T2  - THE ILLUSTRATED ENCYCLOPEDIA OF SCIENCE
SN  - 0-85685-216-3
U1  - 049.52 CLA v.6 
PY  - 1978///
CY  - 
PB  - MARSHALL CAVENDISH
KW  - 各国百科全书
ER  -