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 copy of the Yellowstone Park Map from a 1939 guidebook.

Black and white lantern slide of the Twin Lakes, Yellowstone National Park. Taken from the summit towards the northeast entrance.

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 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.

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

Black and white lantern slide copy of a geological map of Yellowstone National Park and Yellowstone Forest Reserve from an unknow source.

Black and white lantern slide copy of a sketch cross-section of Amethyst Mountain in Yellowstone National Park, from an unknown source.

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

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

Black and white photograph of a mountain partially covered with trees.

Black and white photograph of a mountain partially covered with trees.

Black and white photograph of a road next to a mountainside with a mountain range visible in the distance.

Black and white photograph of Gibbon Falls in Yellowstone National Park. Gibbon Falls is surrounded by mountains and forest.

Black and white photograph of the Fountain Geyser at Yellowstone National Park. Steam is rising from the geyser, and a pine tree stands between the geyser and the photographer.

Black and white close-up photograph of Punch Bowl Spring in Yellowstone National Park.

Black and white photograph of the active Jewel Geyser in front of a forest at Yellowstone National Park.

Black and white photograph of a crowd of people watching Old Faithful erupt in Yellowstone National Park (mile 17649.)