May 1941. Washington, D.C. "Rent a bicycle -- Sunday recreation at the Tidal Basin." Medium format negative by Martha McMillan Roberts. View full size.

A slide from a collection I purchased at the swap meet a few years back. They had belonged to an Air Force sergeant and his wife and dated from the 1950s to the 1970s; this one was marked May 1960. View full size.

July 1941. "Work on streetcar tracks, Fourteenth and G Streets N.W., Washington, D.C." Medium format negative by Martha McMillan Roberts. View full size.

July 1939. "Rooftop parking, Washington, D.C." Pedestrians look left, right, and up. Medium format negative by David Moffat Myers. View full size.

May 1950. "University of Notre Dame football quarterback Bob Williams posed as if signing autographs for a group of college women." 3x4 inch Kodachrome transparency by Frank Bauman for the Look magazine assignment "Grantland Rice's Football Forecast for 1950." View full size.

San Francisco circa 1920. "Haynes 'Fourdore' four-passenger roadster." The buggy with the baby bump in back. Glass negative by Christopher Helin. View full size.

Buffalo, New York, circa 1900. "Buffalo River and elevators, foot of Main Street." 8x10 inch dry plate glass negative, Detroit Publishing Company. View full size.