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  1. 21
    Annals of the Astronomical Observatory of Harvard College.
    Published 1856
    Serial
  2. 22
    Circular /
    Published 1895
    Serial
  3. 23
    Contributions from the Perkins Observatory, Ohio Wesleyan University and Ohio State University.
    Serial
  4. 24
    Tokyo astronomical bulletin.
    Published 1927
    Serial
  5. 25
    Transactions of the Astronomical Observatory of Yale University.
    Published 1887
    Serial
  6. 26
    The handbook of the British Astronomical Association.
    Serial
  7. 27
    The Observer's handbook.
    Serial
  8. 28
    Publications de l'Observatoire de Genève.
    Published 1930
    Serial
  9. 29
    Veröffentlichungen des Astronomischen Rechen-Instituts zu Heidelberg.
    Serial
  10. 30
    International physics & astronomy directory.
    Serial
  11. 31
    Publications of the Dominion Astrophysical Observatory.
    Published 1922
    Serial
  12. 32
    Astronomical calendar /
    Serial
  13. 33
    Publications of the Earth Physics Branch.
    Published 1970
    Serial
  14. 34
    Directory of physics & astronomy staff.
    Serial
  15. 35
    Publications of the Allegheny Observatory of the University of Pittsburgh.
    Serial
  16. 36
    Annals of the Tokyo Astronomical Observatory.
    Published 1937
    Serial
  17. 37
    Annuaire de l'Observatoire royal de Belgique.
    Published 1913
    Serial
  18. 38
    Transactions of the International Astronomical Union.
    Published 1922
    Serial
  19. 39
    Space education.
    Published 1981
    Serial
  20. 40
    Astronomical phenomena for the year ... /
    Published 1950
    Government Document Serial
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