Emerton, L. Value : counting ecosystems as water infrastructure / Counting ecosystems as water infrastructure - Gland, Switzerland : IUCN, c2004. - 88 p. : Ill. ; 25 cm. ISBN: 283170720X Subjects--Topical Terms: Ecosystem managementWater-supplyWater conservationWater quality. Dewey Class. No.: 333 IUC 2004 A64 Or.