How much is an ecosystem worth? : assessing the economic value of conservation / - Washington, D. C. : IUCN, the Nature Conservancy/World Bank, c2005. - ix,33 p. : ill. ; 28 cm. ISBN: 0821363786 LCCN: Subjects--Topical Terms: Environmental protectionEconomic aspects Environmental policyEconomic aspects LC Class. No.: HC79 / .E5H677 2005 Dewey Class. No.: 333.72