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Cornelius H.C.
Grinwis

Utrecht (Physics Tree)




Edward Charles
Pickering

Harvard College Observatory


Hermann Carl
Vogel

Astrophysikalische Observatorium Potsdam (Physics Tree)


Julius
Scheiner

Astrophysical Observatory Potsdam


Max
Planck

Universität Berlin (Physics Tree)


George E.
Hale

Yerkes Observatory




Bart J.
Bok

University of Arizona

Donald Jack
Faulkner

(Options)

Donald FaulknerX