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.…
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…