Expeditions & surveys; Railroad surveys; Springs; Bitterroot Range
Near the summit of the Bitter Root Mountains, "a hot spring with a temperature of 132 degrees, around which was a fine prairie camping ground." Plate LVII.
Expeditions & surveys; Railroad surveys; Canyons; Grand Coulee (Wash.)
"The Grand Coulee is about ten miles wide where it opens on the Columbia River at its northern end, which is a hundred feet above the water, and gradually widens toward the south; its walls, eight hundred feet high are formed of solid basaltic...