Most of the photos on this site were extracted from reference images (high-resolution tiffs, 20 to 200 megabytes in size) from the Library of Congress research archive. (To query the database click here.) Many were digitized by LOC contractors using a Sinar studio back. They are adjusted by your webmaster for contrast and color in Photoshop before being downsized and turned into the jpegs you see here.
Vintage photos of:

Washington, D.C., circa 1927. "Y.W.C.A. pool." In the Y's new building at 17th and K Streets. Harris & Ewing Collection glass negative. View full size.

February 1, 1941. "Brooklyn Public Library, Prospect Park Plaza. Children's Room, from balcony." 5x7 safety negative by Sam Gottscho. View full size.

April 11, 1933. "New York City views. Fishing boat at Fulton Market Pier." Medium format acetate negative by Samuel Gottscho. View full size.

"Esplanade Street, New Orleans, 1900." And running along the grassy median, streetcar tracks. Detroit Publishing Company glass negative. View full size.

May 1940. "Untitled." Mr. U and the rest of the Untitleds somewhere near Durham, North Carolina. 35mm nitrate negative by Jack Delano. View full size.

Washington, D.C., circa 1918. "Army soldiers, Walter Reed Hospital." Harris & Ewing Collection glass negative. View full size.

January 23, 1957. "425 Park Avenue From northwest." Going up down the street: The Seagram Building. Safety negative by Samuel H. Gottscho. View full size.