Workers on a Chloro boat, which was used for disinfecting large outdoor swimming areas. This photo was likely taken in the Washington, D.C., area. Photo from the National Photo Company collection, 1921. View full size.

The children of U.S. cabinet members at Easter, April 1922. Photo from the National Photo Company collection. View full size.

Two children talk to a blacksmith standing in the doorway of his forge. Photograph by Frances S. Allen, c. 1900. View full size.

Bill Snyder and Hattie at the Central Park elephant house in 1922. View full size. 5x7 glass negative, George Grantham Bain Collection.

December 5, 1923. Probably Washington, D.C. View full size. 4x5 glass negative, National Photo Company Collection, Library of Congress.

August 1938. "Itinerant photographer in Columbus, Ohio." View full size. 35mm nitrate negative. Photograph by Ben Shahn, Farm Security Administration.

August 1912. Another picture of little Annie Fedele, 22 Horace Street, Somerville, Massachusetts, doing piecework, which usually entailed putting the finishing touches (buttons, or collar and waistband trim) on a mostly completed article of clothing. The garment manufacturers paid a few cents for each piece that was done. View full size. Photograph by Lewis Wickes Hine.