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|Notes:||"On August 2, 1939, Dr. Albert Einstein wrote the following letter to President Franklin D. Roosevelt, warning that the element uranium might be turned into a new important source of energy in the near future, calling for 'watchfulness' and 'quick action' because an 'extremely-powerful' bomb could be constructed.--Intro.|
|Description:||1 volume (unnumbered leaves) : portraits ; 28 cm|