Letter written to US President Franklin D. Roosevelt (1882-1945) by the Director of the US Office of Scientific Research and Development Vannevar Bush

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Letter written to US President Franklin D. Roosevelt (1882-1945) by the Director of the US Office of Scientific Research and Development Vannevar Bush (1890-1974) updating him on the progress of the Manhattan Project. The Manhattan Project was the American project to design and build the world's first atomic bomb during World War II.

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Photo credit: © NARA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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