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Comments on Above Suggested General Catalogue of Nebulae by V. M. Slipher, undated
Edwin Hubble to V. M. Slipher, August 2, 1940, on the requested spectrographs and related work
Edwin Hubble to V. M. Slipher, December 20, 1924, in response to Slipher's request for information
Edwin Hubble to V. M. Slipher, July 14, 1924, in response to several letters
Edwin Hubble to V. M. Slipher, July 22, 1932, on spectrographic rotations of nebulae
Edwin Hubble to V. M. Slipher, July 23, 1923, on Nebulae classification systems
Edwin Hubble to V. M. Slipher in response to questions about Nebulae, undated
Edwin Hubble to V. M. Slipher, April 11, 1930, on nebulae velocity results
Edwin Hubble to V. M. Slipher, December 20, 1927, on current work related to nebulae and star clusters
Edwin Hubble to V. M. Slipher, February 9, 1924, on unclassified nebulae and institutional establishment