TY  - BOOK
AU  - Petroski,Henry
TI  - The evolution of useful things
SN  - 0679412263
AV  - T212 .P465 1992
U1  - 609 20
PY  - 1992///
CY  - New York
PB  - A. Knopf
KW  - Inventions
KW  - Patents
N1  - Includes bibliographical references and index
ER  -