TY  - BOOK
AU  - Mansfield,Edwin
TI  - The economics of technological change / 
U1  - 338.01 23
PY  - 1968///
CY  - London : 
PB  - Loew & Brydone (Printers) ltd, 
KW  - Technological innovations
KW  - United States
KW  - Research, Industrial
N1  - Bibliography includes
ER  -