Black and white lantern slide of the Yellowstone Lower Falls taken from the Uncle Tom Trail.

Black and white lantern slide of a natural bridge rock formation on an upper beach of Lake Yellowstone.

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 of the Old Faithful geyser in eruption taken from Observation Point in Yellowstone National Park.

Black and white lantern slide of the Liberty Cap rock formation in Yellowstone National Park.

Black and white lantern slide of clay varves, or laminated sediment, along the Gibbon River in 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.

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.

Black and white lantern slide of old lava flows on Purple Mountain in Colorado.

Black and white lantern slide of a lava cap south of Pocatello, Idaho, with a railroad and road in the mid and foreground.

Black and white lantern slide showing construction equipment and work on the Deer Creek Dam in Utah.

Black and white lantern slide of mountains at Dinosaur National Monument showing the jurassic era geologic folds.

Black and white lantern slide of a mountain in the Uinta Mountain range.

Black and white lantern slide of a road winding through the Hot Sulphur Springs Canyon in Colorado.

Black and white lantern slide view of Nymph Lake in Rocky Mountain National Park, with mountains rising in the background.

Black and white lantern slide of inscriptions made by William Clark on Pompeys Pillar on July 25, 1806.

Black and white lantern slide of a road sign for the "Home of the Minnesota Man," now known as the Pelican Rapids-Minnesota Woman, skeletal remains estimated at 8,000 years old.

Black and white lantern slide of a man leaning against a wall of stone at the East fork of Greenwood Creek.

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

Black and white lantern slide of the Fish Pot hot spring in Yellowstone National Park.

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