Feature

  1. Barrier Down

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  2. Inroads against a Crippler

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  3. New Ideas and Gadgets

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  4. Films of the Week

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  5. New Ideas and Gadgets

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  6. Life Sciences Notes

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  7. Back Matter

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  8. Front Matter

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  9. Current Patents

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  10. Watson Davis 1896-1967

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  11. Nature Note

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  12. Useless Secrecy and the World Bomb Balance

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