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  1. 1
    local holding
    by Samal, Erwin
    published 1991
    Book
  2. 2
  3. 3
    local holding
    published 1965
    Book
  4. 4
    local holding
    published 1958
    Book
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10
    online resource
    by Becker, Wilhelm
    Published in Vistas in Astronomy (1956)
    Get additional information online
    E-Article
  11. 11
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  13. 13
  14. 14
  15. 15
  16. 16
    local holding
    by Becker, Wilhelm
    published 1950
    Book
  17. 17
  18. 18
  19. 19
  20. 20