September 15, 1961. "Helena Rubinstein, 655 Fifth Avenue, New York. Class in session." Large-format acetate negative by Gottscho-Schleisner. View full size.

Florida circa 1910. "St. George Street, St. Augustine." Where merchants include purveyors of the "Ingersoll Dollar Watch." 8x10 glass negative. View full size.

Circa 1904. "Chicago & Alton Railroad shops at Bloomington, Illinois." At left rear, the Anheuser-Busch beer boxcar. 8x10 inch glass negative. View full size.

April 1957. "Entertainer Lawrence Welk playing accordion with the Lennon Sisters." (Or, as he would introduce them, "The lovely little Lennon Sisters.") Color transparency by Earl Theisen for the Look magazine assignment "Lawrence Welk: Nobody Likes Him Except the Public." View full size.

September 1942. "Washington, D.C. Conversion of the Shoreham Hotel furnace from oil to coal burning system." Crank it, boys, and let's see what this thing'll do. Photo by Howard Liberman for the Office of War Information. View full size.

Circa 1932. "Bladensfield, Warsaw vicinity, Richmond County, Virginia." 8x10 inch acetate negative by Frances Benjamin Johnston. View full size.

Circa 1915, location unknown. "Mailman & motorcycle." And not just any motorbike but a "Flying Merkel," with what looks like an acetylene-gas headlamp. Oh, and Spitting Prohibited by Law, "Except Into Cuspidors." View full size.

Circa 1915. "Mailman and truck," location unknown. Collection times 6:15 a.m. to noon. National Photo Company Collection glass negative. View full size.