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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
Edwin Hubble to V. M. Slipher, June 22, 1926, on sub-committee appointments and potential plagiarism
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 to V. M. Slipher, February 9, 1924, on unclassified nebulae and institutional establishment
Edwin Hubble to V. M. Slipher, December 20, 1927, on current work related to nebulae and star clusters