Color lantern slide of Grand Teton mountain taken from Snake River, Wyoming.

Black and white lantern slide of old lava formations on Amethyst Mountain in Wyoming.

Black and white lantern slide of old lava flow formations near Soda Butte Creek.

Black and white lantern slide of Obsidian Cliff, Wyoming.

Lower Falls of the Yellowstone River, Wyoming.

Mammoth Hot Springs at Yellowstone National Park, Wyoming.

Black and white lantern slide close-up view of petrified trees in the grass with measuring sticks.

Black and white lantern slide of Audie Merrill posing on a hillside next to a fenced-in petrified tree. Two other people, Sinclair and Virginia, are visible through the fence.

Power house below Shoshone Dam, Wyoming.

Shoshone Dam near the entrance to Yellowstone Park, Wyoming.

Shoshone Dam near the entrance to Yellowstone Park, Wyoming.

Small geyser cone at Yellowstone National Park, Wyoming.

Yellowstone National Park is located primarily in Wyoming, but extends into parts of Montana and Idaho. Established as a National Park on March 1, 1872, it was the first national park in the world. It is known for its large variety of wildlife and…

Yellowstone National Park is located primarily in Wyoming, but extends into parts of Montana and Idaho. Established as a National Park on March 1, 1872, it was the first national park in the world. It is known for its large variety of wildlife and…

Wyvern British RN (Royal Navy) fighter, March 1, 1954.

Wyvern British RN (Royal Navy) fighter, March 1, 1954.

Wyvern British RN (Royal Navy) fighter, September 1, 1954.

Wyvern British RN (Royal Navy) fighter, September 1, 1954.

Wyvern British RN (Royal Navy) fighter, September 1, 1954.

Wyvern British RN (Royal Navy) fighter, September 1, 1954.

Wyvern British RN (Royal Navy) fighter, September 1, 1954.

Wyvern TF (torpedo fighter) Mk 4 British RN (Royal Navy) fighter, April 1, 1953.

X-4, US fighter, March 1, 1954.

XA2D Skyshark USN attack aircraft, April 1, 1952.