TY  - BOOK
AU  - Gunatilake, Herath M.
TI  - Environmental valuation: : theory and applications 
SN  - 9789559812104 ; 9559812106
U1  - X551.588 23
PY  - 2003///
CY  -  Peradeniya : 
PB  - Postgraduate Institute of Agriculture University of Peradeniya, 
ER  -