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Edwin Hubble to V. M. Slipher, July 22, 1932, on spectrographic rotations of nebulae
Edwin Hubble to V. M. Slipher, July 8, 1940, on a catalogue of velocities of nebulae
Edwin Hubble to V. M. Slipher, August 2, 1940, on the requested spectrographs and related work
Slipher's Velocities
Edwin Hubble to V. M. Slipher, March 6, 1953, on using images for a lecture
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
Edwin Hubble to V. M. Slipher, April 11, 1930, on nebulae velocity results
Edwin Hubble to V. M. Slipher, June 11, 1941, on the rotation of spiral galaxies and related theories
Edwin Hubble to V. M. Slipher, July 27, 1942, on the draft of his paper "The Direction of Rotation of Spiral Nebulae"