May 19 or 20, 1864. "Fredericksburg, Virginia. Burial of Federal dead. Photograph from the main Eastern theater of war, Grant's Wilderness Campaign, May-June 1864." Wet plate glass negative, Civil War Photographs Collection, Library of Congress. View full size.

March 1943. "Santa Fe Railroad conductor's work table in the caboose enroute to Gallup, New Mexico." Acetate negative by Jack Delano for the Office of War Information. View full size.

April 1943. "Baltimore, Maryland. Repairing the motor of a PCC (Presidents' Conference Committee) trolley -- the most recent streetcar model, designed in 1936 by a group of manufacturers and transit companies in an effort to standardize, simplify, and bring down the price; at the damage shop, maintenance terminal of the Baltimore Transit Company." Acetate negative by Marjory Collins for the Office of War Information. View full size.

April 1943. "Baltimore, Maryland. One-armed painter, hired since the war, repainting the interior of a trolley at the maintenance terminal of the Baltimore Transit Company." Acetate negative by Marjory Collins for the Office of War Information. View full size.

March 1943. "Lynchburg, Virginia -- railroad station." Medium format acetate negative by John Vachon for the Office of War Information. View full size.

April 1943. "Baltimore, Maryland. Transportation for war-swollen population. Traffic jam as workers of the first shift leave the Bethlehem Fairfield shipyards in cars and trolleys on the road to Baltimore." Photo by Marjory Collins for the Office of War Information. View full size.

March 1943. "Albuquerque, New Mexico. Workmen washing up at the end of the day at the Atchison, Topeka and Santa Fe Railroad locomotive shops." Medium format acetate negative by Jack Delano for the Office of War Information. View full size.

April 1943. Baltimore, Maryland. "Transportation for war-swollen population. The yard of Washington Terminal, maintenance plant of the Baltimore Transit Co. From left to right: old trolley made into a smoker for employees; a work car; and an old horse car. Baltimore Trust building on the horizon." Photo by Marjory Collins, Office of War Information. View full size.

March 1943. "Clovis, New Mexico. Private Clarence Stephens of Streator, Illinois, a member of the U.S. Army Railroad Battalion stationed at Clovis, with Sidney Mack, engine inspector at the Atchison, Topeka and Santa Fe Railroad shops. They are inspecting one of the 5000 Class freight engines." Acetate negative by Jack Delano, Office of War Information. View full size.

July 16, 1918. "Alex, a fourteen-year old working boy in St. Etienne, France (last seen here), was found intently studying the playground exhibit at the Children's Welfare Exposition of the American Red Cross. He has been working since 11 years of age, and said: 'On account of the high cost of living, I now get four and a half francs a day'." 5x7 inch glass negative by Lewis Wickes Hine for the American National Red Cross. View full size.

June 14, 1918. "In a corridor of the American Military Hospital No. 1 at Neuilly, France, which has been filled with beds to accommodate the overflow of wounded." 5x7 inch glass negative by Lewis Wickes Hine for the American National Red Cross. View full size.

Washington, D.C., circa 1918. "District National Bank, exterior, G Street N.W." Scrubbing in progress, or a new addition? 8x6 inch glass negative, National Photo Company. View full size.

Washington, D.C., circa 1919, somewhere along M Street. "Big naval gun of type used in France." These 14-inch, 50-caliber railway guns, deployed to France toward the end of World War I, had a range of 24 miles. More information here, here and here. As well as on this plaque. 8x6 inch glass negative, National Photo Company Collection. View full size.

November 4, 1924. "Election night crowd at Washington Star." Two more "election screens," and an election bullhorn. 8x10 inch glass negative, National Photo Company. View full size.

November 1920. Washington, D.C. "Washington Herald election screen." The screen being white sheets hung from this frame on election night, with wire-service voting results projected onto them from a stereopticon -- a practice dating back at least to the 1890s in cities across the United States, and which gradually died out with the advent of broadcast radio. Mold-flecked 4x5 inch glass negative from the National Photo Company Collection. View full size.