Dan Flores is the A. B. Hammond Professor of History at the University of Montana, Missoula. He is the author of numerous books including "Horizontal Yellow: Nature & History in the Near Southwest" & "Caprock Canyonlands: Journies into the Heart of the Southern Plains", & the editor of "Jefferson & Southwestern Exploration: The Freeman & Custis Accounts of the Red River Expedition of 1806" (University of Oklahoma Press).