TY  - BOOK
AU  - Jewkes,John
AU  - Sawers,David
AU  - Stillerman,Richard
TI  - The sources of invention
T2  - Norton library N502
SN  - 039300502X
AV  - T212 .J4 1969b
U1  - 608.7 
PY  - 1969///]
CY  - New York
PB  - W. W. Norton
KW  - Inventions
N1  - Includes bibliographical references
ER  -