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Subjects
- Abdomen -- surgery1
- Accident Prevention1
- Adolescent1
- American Civil War1
- Calla Plant1
- Child2
- Color1
- Commerce1
- Dark Adaptation2
- Electric Power Supplies1
- Electricity1
- Equipment Design2
- Eyeglasses1
- Fossil Fuels1
- Fossil Fuels -- analysis1
- Gases -- toxicity1
- Hazardous Substances -- standards1
- Heating1
- Hospitals, Military1
- Hot Temperature1