TY  - BOOK
AU  - Mokyr Joel
TI  - Twenty five centuries of technological change: An Historical Survey   
T2  - fundamentals of poure and Applied Economics , 35
U1  - X0gF, N0 
PY  - 1990///
CY  - London
PB  - Harwood Academic         
KW  - Economic IRT Technology
N1  - Bibliography: P 117-31
ER  -