. . "Montana" . . "Yellowstone National Park" . . . . . . . . . . . . . . . . . "Exploring Nature's Sanctuary: Captain William Ludlow's Report of a Reconnaissance from Carroll, Montana Territory, on the Upper Missouri to the Yellowstone National Park, and Return Made in the Summer of 1875"@en . "Exploring nature's sanctuary Captain William Ludlow's report of a reconnaissance from Carroll, Montana Territory, on the upper Missouri to the Yellowstone National Park, and return made in the summer of 1875"@en . . . "Exploring nature's sanctuary : Captain William Ludlow's report of a reconnaissance from Carroll, Montana Territory, on the upper Missouri to the Yellowstone National Park, and return made in the summer of 1875"@en . . . . . "U.S. Dept. of the Army. Historical Division." . . "West (U.S.)" . .