TY  - BOOK
TI  - Inventors and discoverers: changing our worlsd
SN  - 0-87044-752-1
U1  - GR 609 I622 1988 
PY  - 1988///
CY  - Wasington, D.C.
PB  - National Geographic Book Service
KW  - Inventions-History
N1  - Includes index
ER  -