Black and white lantern slide of a man standing in a water-filled ditch in which a mammoth tooth was found in Allegan County, Michigan. Several men stand or crouch on higher ground nearby.

Black and white lantern slide wedding portrait of Robert H. Merrill and Audie Sinclair Weston Merrill on the steps of a church or courthouse.

Black and white lantern slide wedding group portrait of Robert H. Merrill and Audie Sinclair Weston Merrill with wedding guests.

Black and white lantern slide wedding group portrait of Robert H. Merrill and Audie Sinclair Weston Merrill with wedding guests.

Black and white lantern slide wedding group portrait of Robert H. Merrill and Audie Sinclair Weston Merrill with wedding guests.

Black and white lantern slide of a group of around 20 school children gathered around the excavation site at the Jonio farm.

Black and white lantern slide of Tahquamanon Falls.

Black and white lantern slide of a man, Tony, holding a mammoth tooth in his right hand.

Black and white photograph of two people standing on a wood bridge at Fox Creek. Taken by Robert Merrill on a trip to Middleburgh, New York.

Black and white photograph of a wooden covered bridge at Fox Creek. Taken by Robert Merrill on a trip to Middleburgh, New York. A car can be seen at the bridge opening.

Black and white photograph of falls at the Mill River (Rivière du Moulin) in Québec.

Black and white photograph of mines at Goldfield, Colorado. Taken by Robert Merrill from a stationary train.

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 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 lantern slide copy of a geological map of St. Paul, Minnesota.

Black and white photograph of a section of Minnicognashene Island, Georgian Bay, Ontario.

Black and white photograph of the Minute Man Geyser in eruption at Yellowstone National Park.

Black and white photograph of a Mississippi River bridge at Dubuque, Iowa. Water damage is visible on the image, which was scanned from the negative.

Black and white photograph of a Mississippi River bridge at Winona, Minnesota. Water damage is visible on the image, which was scanned from the negative.

Black and white lantern slide of the Mongolian tower at the Winter palace in Beijing, China's Forbidden City.

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

Black and white photograph of the Steamship Montello at Galveston Dock.

Steamship Montello, 6400 tons loading at Mobile, Alabama.