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  1. 1
    “...Harvard College Observatory...”
    Journal
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    Sky and telescope.
  2. 2
    “...Harvard College Observatory...”
    Journal
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    Bulletin /
  3. 3
    “...Harvard College Observatory...”
    Journal
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    Annals of the Astronomical Observatory of Harvard College.
  4. 4
    Published 1948
    “...Harvard College Observatory...”
    Book
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    Centennial symposia, December 1946 : contributions on interstellar matter, electronic and computational devices, eclipsing binaries, the gaseous envelope of the earth.

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