Feature

  1. Loops in the Linear

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  2. DNA Repair

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  3. A Gamma-Ray Galaxy

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  4. Science-Mission Reliability

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  5. EPA and AEC

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  6. Science Newsbriefs

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  7. Medical Sciences

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  8. Physical Sciences

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  9. Books of the Week

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  10. Microwaves from the Planets

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  11. Mars Nearing the Earth

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  12. Back Matter

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