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V. M. Slipher to Edwin Hubble, March 20, 1953, on use of slides and spectra about nebulae for lecture
Edwin Hubble to V. M. Slipher, March 6, 1953, on using images for a lecture
Slipher's Velocities
Edwin Hubble to V. M. Slipher, August 2, 1940, on the requested spectrographs and related work
Edwin Hubble to V. M. Slipher, July 8, 1940, on a catalogue of velocities of nebulae
V. M. Slipher to Edwin Hubble, August 4, 1932, on his spectrographic observations
Edwin Hubble to V. M. Slipher, July 22, 1932, on spectrographic rotations of nebulae
V. M. Slipher to Edwin Hubble, September 7, 1942, on Hubble's manuscript draft and multiple interpretations
Edwin Hubble to V. M. Slipher, July 27, 1942, on the draft of his paper "The Direction of Rotation of Spiral Nebulae"
Edwin Hubble to V. M. Slipher, April 11, 1930, on nebulae velocity results