TY  - BOOK
AU  - Berndt Ernst R
AU  -  Field Barry C Ed.
TI  - Modeling and measuring natural resource substituti
U1  - X:271:(B), M1 
PY  - 1981///
CY  - Cambridge
PB  - MIT          
KW  - Natural Resources Economics
N1  - Bibliography: P 290-306
ER  -