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:

Freight depot of the Army consolidating station at Chicago. April 1943. View full size. 4x5 Kodachrome transparency by Jack Delano.

Illinois Central freight cars at the South Water Street terminal, Chicago. May 1943. View full size. 4x5 Kodachrome transparency by Jack Delano.

June 1942. Cable tower from which buckets carry materials used in the construction of Shasta Dam, California. View full size. 4x5 Kodachrome transparency by Russell Lee.

Washington, D.C. "Smithsonian Institute, 1860-1865." Wet collodion glass plate, Brady-Handy Collection. View full size.

"Trinity Episcopal Church, 3rd & C & Ind. Ave." Unfinished Capitol in the background, circa 1863-64. View full size. Brady-Handy Collection.

Deadwood City Hall in 1890 shortly after its completion. Note fire wagons in garage, fire alarm and fire hydrant. The building burned to the ground in 1952. Those are electric arc lights mounted up near the belfry. View full size. Photograph by John C.H. Grabill.