TY  - BOOK
TI  - How much is an ecosystem worth?  assessing the economic value of conservation. -
SN  - 978-0-8213-6378-6
U1  - 333.7 HOW 
PY  - 2005///
CY  - Washington, D.C.
PB  -  The World Bank
KW  - Economic value- environment
ER  -