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

Black and white photograph showing a down-northwestard view from Pikes Peak Summit Plaque.

Black and white lantern slide of Dr. George Grant MacCurdy working at Abri des Merveilles, Sergiac.

Black and white photograph of a group of people standing next to the Dragon's Mouth at Yellowstone National Park (mile 17450).

Black and white photograph of the drawbridge span at the Soulanges Canal in Québec. Water damage is visible on the image, which was scanned from the negative.

Black and white lantern slide of Paleolithic drawings of bison from Niaux cavern.

Black and white photograph of the dredge Empire 5522, taken by Robert Merrill looking west. Lettering is printed along the arm of the dredge reading, "Built by the Marion Osgood Company Marion, Ohio." Water damage is visible on the image, which was…

Black and white photograph of Drs. Cooke and Leverett on Folly Beach at Charleston, South Carolina. Tree stumps and sand dunes are visible in the background.

Black and white photograph of a hilly countryside of fields intersected by lines of trees in Otsego County, New York.

Black and white photograph of hilly countryside in Otsego County, New York, with a farmhouse and barn in the distance.

Black and white photograph of a man standing atop a drumlin, or hill formed of rock debris. Likely taken near Clinton, New York.

Black and white lantern slide of a dry canal bed running through a Chinese village.