by Andre Norton (1200)
Time Agents Ross Murdock and Gordon Ashe, aided by a Polynesian girl and her team of telephatic dolphins, probe the mystery of the sea-planet men have named Hawaika. Its cities and civilizations have vanished, but our agents are snatched back through a Time Gate and marooned in the midst of the struggle for power that mist have destroyed the planet.
Bel Mooney
When his family moves to a large rambling house in the English countryside, Daniel discovers an old stove which leads to a journey into the past, to 1835, where as a kitchen servant, he becomes involved in the local farm workers' dangerous plans to form a union.
Myra McEntire
"From the moment the Hourglass group violated the rules of the space time continuum to rescue a murdered loved one, time has been in flux. People from other centuries slide into our time, intruding into our space, threatening our world. Frantically seeking a way to turn back this tide, the Hourglass begins a search for the legendary Infinityglass, tracking it to the city of New Orleans, a place where the past rests easily with the present. Quiet, reliable Dune, the group's favorite geek, is selected to travel to the Crescent City and somehow retrieve the renowned object. But there's a problem. Because the Infinityglass is not an object, it's a person. A beautiful, headstrong dancer named Hallie, a girl so enticing Dune can't take his eyes off her. And time is not on her side."--Jacket.
John Bellairs
Johnny Dixon and Professor Childermass discover a trolley which transports them back to Constantinople in 1453 as the Turks are invading the Byzantine Empire.
D.J. MacHale
Bobby Pendragon is a seemingly normal fourteen-year-old boy. He has a family, a home, and even Marley, his beloved dog. But there is something very special about Bobby. He is going to save the world. And not just Earth as we know it. Bobby is slowly starting to realize that life in the cosmos isn't quite what he thought it was. And before he can object, he is swept off to an alternate dimension known as Denduron, a territory inhabited by strange beings, ruled by a magical tyrant, and plagued by dangerous revolution. If Bobby wants to see his family again, he's going to have to accept his role as savior, and accept it wholeheartedly. Because, as he is about to discover, Denduron is only the beginning.