Henry Darwin Rogers is a familiar figure in the history of American geology, especially as the director of the first state geological surveys of New Jersey and Pennsylvania. Although best remembered for the survey work, Rogers considered his theory of mountain elevation to be his most important scientific legacy. Based on studies of the Appalachian Mountains, Rogers's elevation theory was the first American explanation of the dynamics of elevation. As a study of the Pennsylvania survey, this volume offers new insight into the origin and problems associated with early surveys. As a study of Rogers's life and work, it presents a portrait of a man with strong convictions and dedication and examines the development and application of his ideas.

In this thrilling narrative history of the Civil War’s most strategically important campaign, Winston Groom describes the bloody two-year grind that started when Ulysses S. Grant began taking a series of Confederate strongholds in 1861, climaxing with the siege of Vicksburg two years later. For Grant and the Union it was a crucial success that captured the Mississippi River, divided the South in half, and set the stage for eventual victory. Vicksburg, 1863 brings the battles and the protagonists of this struggle to life: we see Grant in all his grim determination, Sherman with his feistiness and talent for war, and Confederate leaders from Jefferson Davis to Joe Johnston to John Pemberton. It is an epic account by a masterful writer and historian.