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Subjects
- Materials Testing1
- Military Personnel22
- Military Science1
- Motor Vehicles17
- Noise -- adverse effects1
- Particulate Matter -- adverse effects1
- Respiratory Protective Devices2
- Thermal Conductivity1
- United States29
- Vehicle Emissions6
- Vehicle Emissions -- poisoning1
- Vehicle Emissions -- prevention & control1
- Ventilation11
- Weapons12
- World War II21