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- Pollution[remove]24
- Air12
- Environmentalism3
- Smoking3
- Water3
- Cigarette Smoke2
- Passive Smoking2
- Abnormalities, Human1
- Acid Rain1
- Adventist Health Study1
- Bible. N.T. Hebrews 10:17 -- Criticism, interpretation, etc1
- California1
- Cancer1
- Central California1
- Children1
- Conservation of Natural Resources1
- Ecology1
- Editor's note1
- Environmental Aspects1
- Environmental Policy1