RT @BeineckeLibrary: Sir Isaac Newton donated this copy of his Principia to Yale. It now resides in the 1742 Library at the Beinecke. http://t.co/MgMaTWj6q0

RT @BeineckeLibrary: Sir Isaac Newton donated this copy of his Principia to Yale. It now resides in the 1742 Library at the Beinecke. http://t.co/MgMaTWj6q0:

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