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Re:Are We Losing the Secrets of the Masters? by spiritplumber on Tuesday October 15, 2013 @07:26AM (#6552612)
Don't forget "The man who came early", which deals with just the sort of cannot-reconstruct-the-technology-chain issue in case of accidental time travel.
Re:Are We Losing the Secrets of the Masters? by esperluette on Tuesday October 15, 2013 @09:31AM (#6553094)
And of course the handy Time Traveler's Poster from Topatoco ...