TY  - BOOK
ED  - Time-Life Books.
TI  - Machines & inventions
SN  - 0809497042
AV  - TJ147 .M22 
U1  - 621.8 20
PY  - 1993///]
CY  - Alexandria, Va.
PB  - Time-Life
KW  - Machinery
KW  - Juvenile literature
KW  - Inventions
KW  - Discoveries in science
N1  - Includes index
ER  -