TY  - BOOK
AU  - Clarke,Donald
TI  - The Encyclopedia of How It Works from Abacus to Zoom Lens
SN  - 0894790021 :
AV  - T47 .E53 1977
U1  - 603 22
PY  - 1977///
CY  - New York
PB  - A & W Publishers
KW  - Technology
KW  - Encyclopedias
N1  - Includes index
ER  -