GEORGE R. MATTHEWS. Zebulon Pike: Thomas Jefferson’s Agent for Empire. Hardcover, 184 pages, $37. ABC-CLIO, Praeger. www.abc-clio.com/Praeger.aspx

This  history chronicles Zebulon Pike’s 1806-1807 expedition to the Rocky Mountains and beyond, addressing both the exploratory and clandestine purposes of his western journey. By carefully examining the evidence available in primary documents, which shows that Pike prepared and carried a map showing a route to Santa Fe on his journey, the author overturns the conventional wisdom that Pike became lost searching for the Red River and mistakenly wandered into Spanish territory.