Edwin Hubble sources

http://www.edwinhubble.com/hubble_bio_001.htm
http://www.spacetelescope.org/about/history/the_man_behind_the_name/
http://apod.nasa.gov/diamond_jubilee/1996/sandage_hubble.html
http://www.answers.com/topic/edwin-hubble
http://burro.astr.cwru.edu/stu/20th_people_hubble.html