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  1. X-Ray Astronomy: The Long and Short

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  2. Lagrangia: Pioneering in Space

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  3. New Books

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  4. Freon: Destroying the Ozone Layer?

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  5. Radiation and the Law

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  6. NAS Scores EPA’s Research Setup

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  7. Back Matter

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  8. Front Matter

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  9. Oysters, Algae & Sewage

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  10. Mariner 10 Returns to Mercury

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  11. Mathematicians Hail New Theory

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  12. New Books

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