Doomsday Book (Oxford Time Travel #1) by Connie Willis

For Kivrin, preparing an on-site study of one of the deadliest eras in humanity's history was as simple as receiving inoculations against the diseases of the fourteenth century and inventing an alibi for a woman traveling alone. For her instructors in the twenty-first century, it meant painstaking calculations and careful monitoring of the rendezvous location where Kivrin would be received.

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Blackout (Oxford Time Travel #3 / All Clear #1) by Connie Willis

Oxford in 2060 is a chaotic place, with scores of time-traveling historians being sent into the past. Michael Davies is prepping to go to Pearl Harbor. Merope Ward is coping with a bunch of bratty 1940 evacuees and trying to talk her thesis adviser into letting her go to VE-Day. Polly Churchill’s next assignment will be as a shopgirl in the middle of London’s Blitz.

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All Clear (Oxford Time Travel #4 / All Clear #2) by Connie Willis

In Blackout, award-winning author Connie Willis returned to the time-traveling future of 2060—the setting for several of her most celebrated works—and sent three Oxford historians to World War II England: Michael Davies, intent on observing heroism during the Miracle of Dunkirk; Merope Ward, studying children evacuated from London; and Polly Churchill, posing as a shopgirl in the middle of the Blitz.

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Waterfall (River of Time #1) by Lisa Tawn Bergren

What do you do when your knight in shining armor lives, literally, in a different world?
Most American teenagers want a vacation in Italy, but the Betarrini sisters have spent every summer of their lives among the romantic hills with their archaelogist parents. Stuck among the rubble of the medieval castles in rural Tuscany, on yet another hot, dusty archaeological site, Gabi and Lia are bored out of their minds...until Gabi places her hand atop a handprint in an ancient tomb and finds herself in fourteenth-century Italy.

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Cascade (River of Time #2) by Lisa Tawn Bergren

What if you not only fell back through time...but fell in love, too?

Gabi knows she's left her heart in the fourteenth century, and she persuades Lia to help her to return, even though they know doing so will risk their very lives. When they arrive, months have passed, and all of Siena longs to celebrate the heroines who turned the tide in the battle against Florence--while their enemies will go to great lengths to see them dead.

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Torrent (River of Time #3) by Lisa Tawn Bergren

Would you sacrifice your future ... for an uncertain past?

Gabriella and Evangelia Betarrini are just two normal American teenagers. Normal--except for the fact that they time travel to fourteenth-century Italy, where they've lived in castles, become swept up in historic battles, and fallen in love with handsome knights willing to do anything to keep them alive.

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Deluge (River of Time #4) by Lisa Tawn Bergren

The Bettarinis and Forellis have found rich fulfillment together in medieval Italia. But after fighting off countless enemies, they now must face the worst foe of all. As the Black Death closes in upon them, threatening everything and everyone they hold dear, Lia and Gabi–and the knights they love–must dig deep within to decide how they might remain safe…and if they need to risk it all in order to truly live as they’re called.

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Timeline by Michael Crichton

In an Arizona desert, a man wanders in a daze, speaking words that make no sense. Within twenty-four hours he is dead, his body swiftly cremated by his only known associates. Halfway around the world, archaeologists make a shocking discovery at a medieval site. Suddenly they are swept off to the headquarters of a secretive multinational corporation that has developed an astounding technology. Now this group is about to get a chance not to study the past but to enter it.

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The Alexander Inheritance by Eric Flint, Gorg Huff, Paula Goodlett

NEW TIME TRAVEL ALT. HISTORY FROM A MASTER: Flint's Ring of Fire and Boundary series have proved him to be a master of time travel alternate history. Here then, a new tale of persons displaced in time, fighting for their lives.

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