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Eight-year-old Jack and his younger sister Annie find a magic tree house, which whisks them back to an ancient time zone where they see live dinosaurs.

Dak, Sera, and Riq have fixed the Great Breaks in history, but SQ is not beaten yet, and the biggest, boldest Infinity Ring adventure of all time has just begun.

"As bloody battle rages on between the two surviving dinosaur kingdoms, Eleri and his fellow outcasts, newly exiled from their herds, are searching for evidence to prove a mass conspiracy--a conniving cabal of carnivores have manipulated the herbivore kingdoms into war, so they can feast on the slain.

When the mysterious first aid kit takes golden retriever Ranger to New Orleans shortly before Hurricane Katrina hits, he finds himself helping Clare Porter and her grandmother, who are waiting for Clare's father at their home in the Lower Ninth Ward--and when the levees break and Clare is separated from Nana, Ranger must somehow get her to the relative safety of the Superdome, and reunite her with her family.

"At the flea market nine-and-a-half-year-old Chase and his younger sister Ava acquire an old suitcase filled with rows of carefully packed strange objects, and when they handle one of the objects (a dragon-headed doorknob) they find themselves in King Arthur's castle, on a mission to save the King--and pursued by a strange man whom they first saw at the flea market, who is after their suitcase"--Provided by publisher.

These two ninja have always been close. But now the evil time twins are back, and they are revealing secrets from Kai and Nya's family history.

"With the realm at peace and few dragons about, the Knights of the Round Table are bored, so Merlin sends them to face the most terrible lizards of all--dinosaurs"--Provided by publisher.

"This time the mysterious box transports the golden retriever Ranger back to the shipyards of Belfast in 1912, where a ship is being prepared for her maiden voyage, and when he saves young Patrick Murphy from being crushed by falling boards, Ranger expects to be transported home; when he is not, he knows that somehow his job is not finished--but then, Ranger has never heard of the Titanic, and knows nothing of the fate that awaits Patrick, and all the other people on board"--Provided by publisher.

Ranger the time-travelling Golden retriever and young Isaac Pope come together in 1776 during Washington's retreat after the Battle of Long Island, and Ranger stays with Isaac while he slowly recovers from Smallpox--but Ranger's real mission comes later when Isaac is sent to spy out the Hessian troops' intentions before the Battle of Trenton.

Follow the dogs Baxter, Trevor, Newton, Maia and Titch as they are transported back in time to 1805 Missouri, now as puppies, and must help Seaman and his traveling companions--the explorers Lewis and Clark.

"Mateo, Ruby, and Corey Hudson have lost their friend Jia to the villainous Captain Vincent's clutches, and now they're determined to bring her back to safety.

On a visit to the Natural History Museum, Chase and Ava seem on the verge of finding out something important about the mysterious Randall, the missing scientist Finn, and the woman who gave them the suitcase filled with magical objects, when the dinosaur egg from the suitcase (they thought it was a potato) sends them back to dinosaur times--where they have to return the egg to the correct brontosaurus nest, while eluding hungry dinosaurs, and Randall, who it turns out is working for somebody called The Collector.

"The reader's choices determine whether two classmates will survive after being mysteriously transported back in time towhen exotic plants towered overhead and giant rat-like creatures scuttled on the ground"--OCLC.

The reader's choices determine whether three friends will survive after being mysteriously transported back in time to when the climate was cold and saber-toothed cats and wooly mammoths roamed the land.

"The reader's choices determine whether three friends will survive after being mysteriously transported back in time to when huge insects swarmed the skies and fearsome dinosaurs ruled"--OCLC.