Atomic Bomb and Hiroshima

Manhattan Project - http://www.britannica.com/eb/article-9050535/Manhattan-Project
B-29 - http://www.britannica.com/eb/article-9011571/B-29
Atomic Bomb - http://www.britannica.com/eb/article-9010127/atomic-bomb
The Decision to Use the Atomic Bomb - http://www.britannica.com/eb/article-9344715/The-decision-to-use-the-atomic-bomb
Hiroshima - http://www.britannica.com/eb/article-9040562/Hiroshima
Nagasaki - http://www.britannica.com/eb/article-9054649/Nagasaki