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V. M. Slipher to Edwin Hubble, December 10, 1927, on committee meeting reports and surveys
V. M. Slipher to Edwin Hubble, August 4, 1932, on his spectrographic observations
V. M. Slipher to Edwin Hubble, August 29, 1923, on wedding news and bibliography project progress
V. M. Slipher to Edwin Hubble, August 18, 1923, on Slipher's manuscript and eclipses
V. M. Slipher to Edwin Hubble, March 19, 1925, in congratulations of his award and on the Nebulae Commission
V. M. Slipher to Edwin Hubble, December 16, 1924, requesting information and preliminary reports on Hubble's projects
V. M. Slipher to Edwin Hubble, December 10, 1927, on Committee on Nebulae and Star Cluster work and meetings
V. M. Slipher to Edwin Hubble on publishing a paper about requesting use of Mt. Wilson nebulae photographs, Undated.
V. M. Slipher notes on nebulae rotation and nearer edges
The Classification of Nebulae manuscript