Schulz Christopher R Surface water treatment for communities in developing countires Schulz Christopher R; Okum Daniel A - London Intermediate Technology publications 1984 - 299p ISBN: 1853391425(pbk) Standard No.: 2508 Source: Textual Subjects--Topical Terms: Developing Countries Purification Sanitary WaterEngineering Dewey Class. No.: D855.1(X), M4