Mount Shasta, California.

Mount Shasta, California.

Black and white photograph of rocks at Point Sublime, taken by Robert Merrill from a stationary train.

Black and white photograph of a peak on the Cripple Creek Railroad in Colorado.

Black and white photograph of rocky landscape at Clyde. The front engine of a train is visible at the lower right edge of the photograph.

Black and white photograph of rocks to the east of a summit. Railroad tracks can be seen through the rocky landscape.

Black and white photograph of the Mt. Manitou Scenic Railway in Colorado. A woman, possibly Lena Merrill, is visible at a distance. A sign to the right reads The Scenic Incline to Mt. Manitou Park.

Black and white photograph, taken by Robert Merrill, looking southwest toward Cripple Creek, Colorado.

Black and white photograph, taken by Robert Merrill, looking southeast toward lakes. Likely taken near Pikes Peak, Colorado.

Black and white photograph showing view of Pikes Peak, Colorado below timber line.

Black and white photograph of Lower Falls, Yellowstone National Park. Taken by Robert Merrill, looking down from brink.

Black and white photograph of a tree-filled valley between two mountains with another mountain in the background.