TY  - BOOK
TI  - Machines & inventions
T2  - (Understanding Science & Nature)
SN  - 0-8094-9704-2
U1  - Ref. 621.8 M149 1993 
PY  - 1993///
CY  - Alexandria, Virginia
PB  - Time-Life
KW  - Machinery
KW  - Juvenile literature
KW  - Inventions
N1  - Includes glossary and index
ER  -