Hubble, Edwin, Edwin Hubble to V. M. Slipher, February 9, 1924, on unclassified nebulae and institutional establishment, 1924-02-09
Hubble sent Slipher a memorandum with the letter to pass on to the Committee on Nebulae at the International Astronomy Union, regarding a proposal for…
Slipher, V. M., V. M. Slipher to Edwin Hubble, March 29, 1924, on contacting Dr. Curtis to discuss bibliography, 1924-03-29
Slipher suggests Hubble contact Dr. Curtis to discuss the bibliography research Hubble has been conducting and briefly describes Curtis, including his…