TY  - BOOK
ED  - Educational technologies limited
TI  - Illustrated encyclopedia of science and nature: machines and inventions I
SN  - 9628851551
U1  - 621.8 
PY  - 2004///
CY  - [Place of publication not identified]
PB  - Educational technologies limited
N1  - Includes glossary; Inventions that changed history---industrial and scientific machines---medical marvels
ER  -