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Start Over You searched for: Formats Text Remove constraint Formats: Text Collections World War 2, 1939-1949 Remove constraint Collections: World War 2, 1939-1949 Subjects Water Purification -- standards Remove constraint Subjects: Water Purification -- standards

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1. Efficiency of standard Army water purification equipment and of diatomite filters in removing cysts of Endamoeba histolytica from water: for official action