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Edwin Hubble to V. M. Slipher, July 23, 1923, on Nebulae classification systems
Edwin Hubble to V. M. Slipher, October 23, 1923, on the Committee on Nebulae and bibliographies
Edwin Hubble to V. M. Slipher, July 14, 1924, in response to several letters
Edwin Hubble to V. M. Slipher, December 20, 1924, in response to Slipher's request for information
V.M. Slipher's Obituary
Edwin Hubble to V. M. Slipher in response to questions about Nebulae, undated
Edwin Hubble to V.M. Slipher, April 4, 1923, on the nebulae report for Schlesinger and his work about nebulae
The Classification of Nebulae manuscript
Edwin Hubble telegram to V. M. Slipher regarding travel plan, undated
Edwin Hubble to V. M. Slipher, February 9, 1924, on unclassified nebulae and institutional establishment