Circa 1925. "Potomac Yards, Alexandria." The railyard just outside Washington in Alexandria, Virginia. National Photo Company glass negative. View full size.

October 1923. Washington, D.C. "Allied Asphalt Products Co." Behind all that smelly hot tar and paving aggregate, under the compacted gravel -- a hidden world of glamour and intrigue! National Photo Company glass negative. View full size.

September 28, 1910. White's Bog, Browns Mills, New Jersey. "Arnao family, 831 Catherine St., Rear #2. Whole family works. Jo is 3 years old. Boy is 6 years old, Girl is 9 years old. We found this family, children and all, working on Hichens farm, Cannon, Delaware, May 28th 1910, before school closed. This is the fourth week of school and the mother said they would be here for 15 or 20 days more. Witness, E.F. Brown." Photo and caption by Lewis Wickes Hine. View full size.

May 1910. Seaford, Delaware. "This photo shows what was formerly a chicken coop, in which during the berry season the Arnao family live on Hitchen's farm. Seventeen children and five elders live here. Ten youngest children range in age from 3 to 13. On the day of the investigation no berries being picked on Hitchen's Farm. The family went over to the Truitt's farm to pick. Edward F. Brown, Investigator." Photograph and caption by Lewis Wickes Hine. View full size.

Washington, D.C., ca. 1905. "Business High." Another batch of young folks sit for their portrait at the H&E studio. Harris & Ewing glass negative. View full size.

February 16, 1926. "Rep. John J. Boylan of New York and territory he proposed cleaning out." National Photo Company Collection glass negative. View full size.

Alexandria, Virginia, circa 1926. "Dr. Fairfax home (Ford Motor Co.)" From a series of photographs, taken for Ford Motor Co., showing Alexandria landmarks. The car here is a Lincoln. National Photo glass negative. View full size.