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Subjects
- Motor Vehicles[remove]47
- United States44
- World War II30
- Military Personnel29
- Air Pollutants, Occupational13
- Ventilation12
- Military Science11
- Vehicle Emissions9
- Weapons9
- Hot Temperature6
- Adaptation, Physiological5
- Optical Devices4
- Carbon Monoxide Poisoning -- prevention & control2
- Chemical Warfare Agents2
- Cold Temperature2
- Dark Adaptation2
- Military Personnel -- statistics & numerical data2
- Night Vision2
- Protective Clothing2
- Telescopes2