"Miss Jane [illegible], 1923." One of three images of Miss Jane in the archive. Who will be the first to identify our mystery aviatrix? National Photo glass negative. View full size. [The answer: Stanton Square reveals her to be Janet Moffett, daughter of Rear Admiral William Moffett.]

Circa 1910. "Annisquam Light. Gloucester, Massachusetts." Detroit Publishing Company glass negative, Library of Congress. View full size.

"District of Columbia, 1917. Traffic Stop and Go signs." Traffic safety in Washington with the Treasury building at left. Note the pedestrian-catcher on the streetcar. Harris & Ewing Collection glass negative. View full size.

"December 16, 1864. Federal outer line. The War in the West. Gen. Hood before Nashville." Wet plate glass negative by George N. Barnard. View full size.

1864. "Nashville. Railroad yard and depot with locomotives; Tennessee Capitol in the distance. From photographs of the War in the West: Hood before Nashville. Continuing his policy of the offensive at any cost, Gen. John B. Hood brought his reduced army before the defenses of Nashville, where it was overthrown by Gen. George H. Thomas on December 15-16, 1864, in the most complete victory of the war. If the date borne on this photograph is correct, it was taken in the course of the battle." Wet plate glass negative by George N. Barnard. View full size.

"Boy Scout training demonstration, 1912." Washington, D.C. Our fourth look at Scout first aid, this one showing a litter made using two poles and some clothing. Harris & Ewing Collection glass negative, Library of Congress. View full size.

March 1943. "Amarillo, Texas, general view. Santa Fe R.R. trip." 4x5 Kodachrome transparency by Jack Delano for the OWI. View full size.

Washington, 1912. "Woodward & Lothrop department store trucks." A detailed look at an early motor truck. Harris & Ewing glass negative. View full size.