gutenberg_org, Newton's own annotated copy of Principia Mathematica.
The Cambridge papers of Sir Isaac Newton, including early drafts and Newton’s annotated copies of Principia Mathematica have been added to UNESCO’s International Memory of the World Register. The chief attractions in the Cambridge collection are Newton’s own copies of the first edition of the Principia (1687), covered with his corrections, revisions and additions for the second edition.
via Cambridge University Library
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