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Elis Strömgren grad student 1908-1909 Copenhagen University
Wilhelm Friedrich Ostwald post-doc 1901-1902 Universität Leipzig (Chemistry Tree)
Hans Emil Lau research scientist 1907-1909 Urania observatory, Copenhagen
Karl Schwarzschild research scientist 1909-1919 Astrophysical Observatory Potsdam


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Willem Jacob Luyten grad student 1921 Leiden
Gerard P. Kuiper grad student 1933 Leiden
Pieter Theodorus Oosterhoff grad student 1933 Leiden (Astronomy Tree)
Kaj Aage Strand grad student 1938 Københavns Universitet (Astronomy Tree)
Adriaan J Wesselink grad student 1938 Leiden (Astronomy Tree)
Lukas Plaut grad student 1939 Leiden (Astronomy Tree)
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