Black and white lantern slide of the masonry walls of the Yen Chow Fu spillway.

Black and white lantern slide of the Yen Chow Fu spillway. A low brick wall separates spillways and a small building sits to the right of the frame.

Black and white lantern slide of the Old Faithful geyser in eruption taken from Observation Point in Yellowstone National Park.

Black and white lantern slide of Robert Merrill standing next to the Lone Star Geyser Cone in Yellowstone National Park.

Black and white lantern slide copy map of the Upper Geyser Basin of Yellowstone National Park from an unknown source.

Black and white lantern slide of the Golden Gate Viaduct in Yellowstone National Park.

Black and white lantern slide of a black bear cub.

Black and white lantern slide of a black bear cub.

Black and white lantern slide copy of the Yellowstone Park Map from a 1939 guidebook.

Black and white lantern slide of rock formations at the Silver Gate site in Yellowstone National Park.

Black and white lantern slide of Roaring Mountain in Yellowstone National Park.

Black and white lantern slide of Lena Merrill standing in front of a boulder in Yellowstone National Park.