Black and white photograph of construction of the south abutment for Watson's Bridge, New York State Canal System.

Black and white photograph of William's Bridge under construction, New York State Canal System. Taken by Robert Merrill from the south.

Black and white photograph of the south abutment for Shelby Bridge under construction, New York State Canal System.

Black and white photograph of the construction of Vernon Street Bridge, Milleport.

Black and white photograph of the north abutment of Shelby's Bridge, under construction.

Black and white photograph of the south abutment for Gorman's Bridge, under construction. Three men and a child can be seen standing around the structure.

Black and white photograph of river walls in Grand Rapids, Michigan, looking north. A bridge and city skyline are visible in the background.

Black and white photograph of rocks at Point Sublime, taken by Robert Merrill from a stationary train.

Black and white photograph of a train crossing a curved trestle bridge.

Black and white photograph of rocks to the east of a summit. Railroad tracks can be seen through the rocky landscape.

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