Fourteen-year-old Sarah is a slave in Maryland during the 1850's. She knows her only chance at freedom is to the North, where slavery is illegal. To get there, though, Sarah needs help from members of the Underground Railroad. But who can she trust? The road to the promised land will not be easy.

"It is the present day and the world is as we know it: smartphones, social networking and Happy Meals. Save for one thing: the Civil War never occurred. A gifted young black man calling himself Victor has struck a bargain with federal law enforcement, working as a bounty hunter for the US Marshals Service. He's got plenty of work. In this version of America, slavery continues in four states called, the Hard Four. On the trail of a runaway known as...

Discusses the Underground Railroad, the secret, loosely organized network of people and places that helped many slaves escape north to freedom.

With Harriet Tubman as her guide, Cassie retraces the steps escaping slaves took on the Underground Railroad in order to reunite with her younger brother.

"Simple text and photographs describe how carrots grow underground"--Provided by publisher.

Waking up in a military complex, months after zombies attacked school, B has no memory of the last few months. Life in the UK has turned tough since the outbreak, and B is woven into life- and battle- in the new military regime quickly. But as B learns more about the zombies held in the complex and the scientists keeping them captive, unease settles in. Why exactly was B saved? And is there anyone left in the world to trust?

In 1969 Colorado acted to clarify its law with respect to under-ground water that is the water in alluvial aquifers hydraulically connected to surface waters. Increasingly this so called tributary groundwater was becoming an important source of supply especially for irrigation. Yet its development had proceeded virtually unregulated until 1965. This paper examines Colorado's experience in integrating the use of tributary groundwater with surface water....