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Subjects
- United States6
- Military Personnel3
- Equipment and Supplies2
- Ventilation2
- Weapons2
- Air Pollutants, Occupational1
- Carbon Monoxide Poisoning -- prevention & control1
- Dust -- prevention & control1
- Ear Protective Devices1
- Motor Vehicles1
- Particulate Matter -- adverse effects1
- Respiratory Protective Devices1
- Vehicle Emissions1
- Vehicle Emissions -- poisoning1
- Vehicle Emissions -- prevention & control1
- World War II1