TY  - BOOK
TI  - How things work
SN  - 0809448734
AV  - REF 620 Ch43 1989
PY  - 1989///
CY  - Alexandria, Va
PB  - Time-Life Books
KW  - Technology
KW  - Juvenile literature
N2  - Questions and answers provide information about how cameras, elevators, car engines, tops, yo-yos, and other devices work. Includes charts, diagrams, and an activities section
ER  -