World Wide School
World Wide School: Atomic Bombing of Hiroshima and Nagasaki
This online book provides a detailed account of the U.S. creation of the atomic bomb, the attack on Hiroshima and Nagasaki, and the aftermath. Written by The Manhattan Engineer District, a military committee, in 1946.
Other
World Nuclear Association: Hiroshima, Nagasaki, and Subsequent Weapons Testing
This article has information about the bombings of Hiroshima and Nagasaki. Additional information about the measures that have been taken about atomic warfare and testing since the bombings included.
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Dannen.com: Atomic Bomb Decision
This site has information about the bombings of Nagasaki and Hiroshima. The information is detailed and in depth. Contains many links to related sites.