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y restrictions. The war ended the exchange of scientific knowledge on this subject, and winning the war was all but a question of which nations would control the discovery.

Late in 1939, the possibility of using atomic energy for

military purposes was brought to the attention of President

Roosevelt. At the end of 1941, the decision was made to go all

out on research work, and the project was put under the direction of a group of eminent American scientists in the office of Scientific Resea

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