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Letter from V. M. Slipher to Edwin Hubble, February 15, 1922, discussing a report on nebulae
V.M. Slipher to Edwin Hubble, March 3, 1922, in receiving Hubble's response on nebulae
V. M. Slipher to Edwin Hubble, March 23, 1923, on the Nebulae publication from 1922
Edwin Hubble to V. M. Slipher, July 23, 1923, on Nebulae classification systems
V. M. Slipher to Edwin Hubble, August 18, 1923, on Slipher's manuscript and eclipses
Edwin Hubble to V. M. Slipher, October 23, 1923, on the Committee on Nebulae and bibliographies
Comments on Above Suggested General Catalogue of Nebulae by V. M. Slipher, undated
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