TY  - BOOK
TI  - On the theory and measurement of technological change. 
AV  - HB199 .B73
PY  - 1966///.
CY  - Cambridge
PB  - Cambridge U.P.
KW  - Economic development
KW  - Mathematical models
KW  - Technology
KW  - History
N1  - Bibliographical footnotes.
ER  -