Rock wall at Clifty Falls near Madison, Indiana.

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

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

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

Black and white lantern slide of Tahquamanon Falls.

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

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

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

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

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

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

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