Hubble, Edwin, Edwin Hubble to American Philosophical Society Committee on Grants-in-Aid, May 28, 1937, on Slipher's search for a new planet, 1937-05-28
This is the copy of the letter Hubble sent in for the grant to search for a new planet. He emphasized that it would answer an important, ongoing…
Slipher, V. M., V. M. Slipher to Edwin Hubble, June 1, 1937, on the American Philosophical Society Grant and congratulations, 1937-06-01
Slipher wrote to Hubble to thank him for his recent letter and his assistance with the American Philosophical Society grant for a new planet search.…