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Tags: Heber Doust Curtis
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Edwin Hubble to V. M. Slipher, December 20, 1927, on current work related to nebulae and star clusters
Hubble, Edwin
1927-12-20
V. M. Slipher to Edwin Hubble, May 21, 1925, on Nebula bibliography and star clusters
Slipher, V. M.
1925-05-21
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