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Read this sometime in the 80's(actually read it after 1999). A mission from an intricate lab (in the present(?)) back to Medieval times went awry when a soldier took back live munitions, specifically a hand grenade, against scientists desires with disastrous results. Other missions had taken place, and the local inhabitants were hostile. Two of the main characters were a man and a woman.

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Critchon. 1999. Not one that stood out as a keeper. – General Decline Jul 12 '14 at 1:39
up vote 12 down vote accepted

This sounds pretty much like Timeline. There is a movie and a book.

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Critchon. 1999. Yes. – General Decline Jul 12 '14 at 1:38
Note that the movie has very little in common with the book, other than the title. – Martha Jul 12 '14 at 2:11
To be fair, the overall story arc & plot points are basically the same, but they did change a lot for dramatic effect. – Omegacron Oct 3 '14 at 16:12

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