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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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1 h 28 m, 2 agos 1939 año - August 2, 1939

Descripción:

Albert Einstein writes President Franklin D. Roosevelt, alerting the President to the importance of research on chain reactions and the possibility that research might lead to developing powerful bombs.

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1 h 28 m, 2 agos 1939 año
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