Feature

  1. A Slight Error

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  2. A Dissent

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  3. Underground Test Detector

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  4. Chemistry

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  5. The Delaney Amendment

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  6. Films of the Week

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  7. Toward a National Policy

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  8. AAAS

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  9. Phosphates on the Spot

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  10. Earth Sciences

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  11. Chemistry

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  12. Irrigation and Climate

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