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:

Warren County, New Jersey, circa 1900. "Manunka Chunk, east end of tunnel." 8x10 inch dry plate glass negative, Detroit Publishing Company. View full size.

August 29, 1922. Washington, D.C. "Plaza baby show." Happy Mother's Day from Shorpy! National Photo Company Collection glass negative. View full size.

February 1939. "Gas station. Edcouch, Texas." One-stop shopping for petroleum and petunias. Medium-format nitrate negative by Russell Lee. View full size.

Kansas City, Missouri, circa 1906. "Walnut Street." Home of the $2 hat. 8x10 inch dry plate glass negative, Detroit Publishing Company. View full size.

"The Hippodrome, New York. A Yankee Circus on Mars." Which was the production that opened this 5,200-seat theater, the world's largest, in April 1905. 8x10 inch dry plate glass negative, Detroit Publishing Company. View full size.

October 6, 1922. Washington, D.C. "Emily Dial, daughter of Senator Dial." National Photo Company Collection glass negative. View full size.

Washington, D.C., circa 1920. "Hoover & Denham." Which is which, the caption doesn't say. National Photo Company Collection glass negative. View full size.