Black and white photograph of Jupiter Terrace, Yellowstone National Park. Taken by Robert Merrill from above. Water damage is visible on the image, which was scanned from the negative.

Black and white photograph of Jupiter Terrace at Yellowstone National Park. Taken by Robert Merrill from below.

Black and white photograph of Kepler Cascades, Yellowstone National Park.

Black and white photograph of Lena Billington Merrill standing below Point Lookout, Yellowstone National Park.

Black and white photograph in portrait orientation of the Lower Falls from Red Rock, Yellowstone National Park.

Black and white photograph of the Minute Man Geyser in eruption at Yellowstone National Park.

Black and white photograph of Mud Volcano, Yellowstone National Park.

Black and white photograph of the Norris Geyser Basin, Yellowstone National Park. Taken by Robert Merrill, looking north. Several figures can be seen at a long distance. Water damage is visible on the image, which was scanned from the negative.

Black and white photograph of the Norris Geyser Basin, Yellowstone National Park. Taken by Robert Merrill, looking northeast. A man can be seen standing at the left of the image, and a horse-drawn carriage appears to be driving up the road from the…

Black and white photograph of Obsidian Cliff, Yellowstone National Park. Water damage is visible on the image, which was scanned from the negative.

Black and white photograph of the Old Faithful geyser in eruption, Yellowstone National Park.

Black and white photograph of a stone pillar. The image is somewhat blurry.