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

Black and white lantern slide view down Saltillo Falls, looking east.

Black and white lantern slide of Tahquamanon Falls.

Black and white lantern slide aerial view of Nevada and Vernal Falls in Yosemite National Park.

Black and white lantern slide of Silver Cascade, a waterfall on the Saco River.

Black and white lanern slide copy of a recession profile diagram of St. Anthony Falls, Minneapolis, Minnesota.

Black and white lanern slide copy of a recession map of St. Anthony Falls, Minneapolis, Minnesota.

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

Black and white photograph of a waterfall among boulders surrounded by trees. A wooden bridge is visible in the distance.

Black and white photograph of a rocky waterfall surrounded by trees.

Black and white photograph of a narrow waterfall on a rocky hillside. Trees are visible on either side of the cascade.

Black and white photograph of Tahquamenon Falls from a point on a hill. People are visible below the photographer walking along the shore of the lake and looking at the waterfall.

Black and white photograph of Tahquamenon Falls from below. A group of people are visible in the bottom of the frame looking at the waterfall.

Black and white photograph of a person standing on a mountaintop next to several trees. Mountains, a valley, and a waterfall are visible in the background.

Black and white photograph showing side view of Montmorency Falls in Québec. Train cars are partially visible in the foreground.

Black and white photograph showing front view of Montmorency Falls in Québec.

Black and white photograph of Lower Falls, Yellowstone National Park. Taken by Robert Merrill, looking down from brink.

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

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

Black and white photograph of Gibbon Falls in Yellowstone National Park.

Niagara Falls from above and below the Canadian Falls, and from above and below the American Falls.

Cataract Falls on Mill Creek in Lieber State Recreation Area in Indiana. Cataract Falls consists of two sets of falls, the larger dropping 20 feet and the smaller dropping 18 feet.

Niagara Falls from above and below the Canadian Falls, and from above and below the American Falls.

Cataract Falls on Mill Creek in Lieber State Recreation Area in Indiana. Cataract Falls consists of two sets of falls, the larger dropping 20 feet and the smaller dropping 18 feet.