Vol. 20 No. #534
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More Stories from the July 4, 1931 issue

  1. Seven Times Rebuilt Pyramid Explored at Tenayuca, Mexico

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  2. 1932 Total Eclipse Will Be Attraction for Vacationists

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  3. Jordan River, Ideal for Power, Is Made to Yield Electricity

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  4. No Ice in North Atlantic; Ice Charts Not Published

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  5. New Type of Prehistoric Indians Found in Texas

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  6. Paradoxes of the Skies

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  7. New Process Cheapens Ultraviolet Glass

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  8. Atmosphere Said to Be Very Hot Fifty Miles above Earth

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  9. In Science Fields

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  10. The Gastric Juice: “A Classic of Science”

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  11. Ice Hung in Baskets Melts More Slowly

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  12. New Moving Pictures in Colors Use Tiny Colored Squares

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  13. Lack of Proper Food May Be Cause of Nearsightedness

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  14. Toy Hammer Tests Musical Talents of Young Children

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  15. Ship Uniformity Desired for Simplified Harbors

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  16. Elusive Aurora Is Duplicated in Evacuated Glass Tube

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  17. New Science Ship Will Work across Ocean

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  18. Magnetism Reveals Differences in Steel

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  19. Nature Ramblings: American Eagles

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  20. Fears New Discoveries May Vitiate Disarmament Moves

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  21. Encke’s Comet Observed by Argentinian Astronomer

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  22. First Glances at New Books

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  23. Front Matter

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  24. Pictures of Spinning Model Demonstrate Atom Structure

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  25. 7,000,000 Acres of Locusts Hatching in East Africa

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