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Start Over You searched for: Subjects United States Remove constraint Subjects: United States Subjects Water Purification -- standards Remove constraint Subjects: Water Purification -- standards Authors National Institute of Health (U.S.), author. Remove constraint Authors: National Institute of Health (U.S.), author.

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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