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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
V. M. Slipher to Edwin Hubble, September 3, 1952, on a recent publication and a Lampland memorial publication
V. M. Slipher notes on nebulae rotation and nearer edges
V. M. Slipher to Edwin Hubble on publishing a paper about requesting use of Mt. Wilson nebulae photographs, Undated.
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, June 11, 1941, on the rotation of spiral galaxies and related theories