Feature

  1. Crops Must Contain Minerals

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  2. Hoover as a Scientist

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  3. Scientific Libraries in Washington

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  4. Classics of Science: Halley’s Comet

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  5. “Electric Steam” in Vatican Library

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  6. Radio and Magnetic Storm

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  7. Nature Ramblings: Harebell

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  8. First Glances at New Books

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  9. Back Matter

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  10. Front Matter

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  11. Fourteen Elected to Science Academy

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  12. A Close-up of Mars

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