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- Drinking1
- Indiana1
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- Military Personnel -- education1
- Minnesota1
- New York1
- North Dakota1
- Plant Weeds1
- Refuse Disposal1
- Sanitary Engineering1
- Sewage -- adverse effects1
- Tuberculosis1
- Typhoid Fever -- prevention & control1
- Warfare1
- Waste Products -- adverse effects1
- Water Pollutants1
- Water Purification -- methods1
- Water Quality1
- Water Wells1