September 1941. "Road leading out of Carlton Tunnel along bed of old narrow gauge railroad on the west side of the Rocky Mountains from Leadville, Colorado." Medium format acetate negative by Marion Post Wolcott for the Farm Security Administration. View full size.

June 1941. "Surveyors at work in Martin County, Indiana, where naval ammunition depot is being constructed on 42,000 acre tract. 160 families will be displaced." Medium format acetate negative by John Vachon for the Farm Security Administration. View full size.

1904. "Union Station -- Dayton, O." In service from 1900 to 1979. 8x10 inch dry plate glass negative, Detroit Photographic Company. View full size.

Hartford, Connecticut, circa 1906. "Colt's Armory." Samuel Colt's historic firearms factory on the banks of the Connecticut River. 8x10 inch glass negative. View full size.

September 1939. "Truck driver who operates between Twin Cities and radius of 150 miles tying in load. Minneapolis, Minnesota." Medium format acetate negative by John Vachon for the Farm Security Administration. View full size.

Cleveland circa 1910. "Superior Viaduct lift bridge and Cuyahoga River." Another bridge, another flour mill! 8x10 inch glass negative, Detroit Publishing Company. View full size.

New York circa 1910. "Williamsburg Bridge and East River waterfront." With a cameo by the Heckers' Flour mill on Water Street. 8x10 glass negative, Detroit Publishing Co. View full size.

July 1938. "View of city of Pittsburgh, Pennsylvania." The Wabash Bridge over the Monongahela River. Medium format acetate negative by Arthur Rothstein. View full size.

July 1938. "Pittsburgh. View of the city from Homestead." Medium format acetate negative by Arthur Rothstein for the Farm Security Administration. View full size.

September 1940. "Locomotives in roundhouse. Durango, Colorado." Medium format acetate negative by Russell Lee for the Farm Security Administration. View full size.

December 1937. "Water tower on railroad through Jennings, Maryland. The train now runs only once a week." Medium format acetate negative by Arthur Rothstein. View full size.

August 1941. "Great Northern grain elevators. Superior, Wisconsin." Medium format acetate negative by John Vachon for the Farm Security Administration. View full size.

June 1941. "Railroad yards. Milwaukee, Wisconsin." Medium format acetate negative by John Vachon for the Farm Security Administration. View full size.

August 1941. "Albany iron mine. Hibbing, Minnesota." A Bucyrus-Erie Model 54-B electric shovel. Acetate negative by John Vachon for the Farm Security Administration. View full size.

June or July 1926. Washington, D.C., or vicinity. "NO CAPTION [Man lying in front of train on tracks]." Perhaps some diligent Shorpysleuth can figure out what's going on here. 4x5 inch glass negative, Harris & Ewing Collection. View full size.