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      Scientific American July 1928

      Problems of Solar Research

      Many Perplexing Puzzles Have Given Way to Astrophysical Research, but Enough Remain to Keep Astrophysicists Occupied

      • By Henry Norris Russell on July 1, 1928

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      More in the July 1928 issue of Scientific American
      • A Mammoth Railroad Fill
      • From the Scrap-book of Science--Camera Shots of Scientific Events, July 1928
      • Man's First Mechanical Achievement
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