TY  - BOOK
AU  - Mitchell Robert Cameron
AU  -  Carson Richard T.
TI  - Using surveys to value public goods :  The contigen valuation method   
SN  - 0 915 707322
U1  - X:7, M9/TD3 
PY  - 1989///
CY  - Washington
PB  - Resources for the future U. S. A.    
KW  - Value
ER  -