Circa 1925. "Whistle Bottling Works." A peek behind the scenes at the Washington, D.C., bottling plant for Whistle orange soda. View full size.

Washington, D.C., circa 1920. "John D. Hayes" is the caption here, perhaps indicating a connection to the Fanny Farmer chain of candy stores. Economics majors have probably heard of Adam Smith's "invisible hand" of the market; here we see evidence of its phantom foot. National Photo Co. View full size.

Washington, D.C., circa 1925. "Homeopathic Hospital." And the leg bone's connected to the knee bone ... National Photo Co. glass negative. View full size.

December 1942. Melrose Park, Ill. "L. Logan, of West Chicago, boilermaker at the Proviso Yard roundhouse, Chicago & North Western R.R." 4x5 Kodachrome transparency by Jack Delano, Office of War Information. View full size.

October 1943. Washington, D.C. "Walter Spangenberg, captain in the Woodrow Wilson High School Cadet Corps, at the school's Regimental Ball." Medium-format negative by Esther Bubley, Office of War Information. View full size.

New York circa 1915. "Brooklyn Bridge, East River and skyline." The Woolworth Building stars in this Lower Manhattan view, with the Singer, Bankers Trust, Hudson Terminal, Municipal and Park Row buildings as understudies. 5x7 inch dry plate glass negative, Detroit Publishing Company. View full size.

February 1939. "On U.S. 99 near Brawley, Imperial County, California. Homeless mother and youngest child of seven walking the highway from Phoenix, Arizona, where they picked cotton. Bound for San Diego, where the father hopes to get on relief 'because he once lived there.'" Medium-format nitrate negative by Dorothea Lange for the Farm Security Administration. View full size.