Mara, Duncan Guidelines for the safe use of wastewater and excreta in agriculture and aquaculture : measures for public health protection / prepared by Duncan Mara & Sandy Cairncross. - Geneva : World Health Organization, 1989. - vii, 187 p. : ISBN: CSMCH1014 Subjects--Topical Terms: Sewage Dewey Class. No.: 628.3623 / Gu