TY  - BOOK
AU  - Cohen Yehoshua S
TI  - Diffusion of an innovation in an urban system :  Th   
T2  - University of Chicago
U1  - X:89K33.73.N68<-N49, L2 
PY  - 1972///
CY  - Chicago
PB  - Universty of Chicago Press       
KW  - Regional Economics
ER  -