EDWIN POWELL HUBBLE: BIOGRAPHICAL MEMOIRS
from an article by N.U. Mayall.
EDWIN HUBBLE 1889-1953
by Allan Sandage
Edwin Hubble Discovers the Universe
Hubble at the 100-inch Hooker Telescope
M100 and the Expanding Universe
From the Proceedings of the National Academy of Sciences
Volume 15 : March 15, 1929 : Number 3
THE LARGE RADIAL VELOCITY OF N. G. C. 7619 By Milton L. Humason
A RELATION BETWEEN DISTANCE AND RADIAL VELOCITY AMONG EXTRA-GALACTIC NEBULAE By Edwin Hubble