http://library.thinkquest.org/17940/texts/timeline/manhattan.html
http://inventors.about.com/od/astartinventions/a/atomic_bomb.htm
Manhattan Project
World War II: Second Atomic Bomb That Ended the War
History of the Atomic Bomb and The Manhattan Project
Albert Einstein and the Atomic Bomb
Atomic Bomb Ends WWII — History.com Video
eacher.scholastic.com/activities/wwii/interview/trans.htm