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:

Exterior view of Price, Birch & Co. slave pen at Alexandria, Virginia, circa 1865. Wet collodion, half of glass plate stereograph pair. View full size.

Interior view showing cells of Price, Birch & Co. slave pen at Alexandria, Virginia, circa 1865. Wet collodion, half of glass plate stereograph pair. View full size.

Price, Birch slave pen cells at Alexandria, Virginia, circa 1865. Wet collodion, half of glass plate stereograph pair. View full size.

March 1936. "One-room hut housing a family of nine built on the chassis of an abandoned Ford in a field between Camden and Bruceton, Tennessee, near the river." 35mm nitrate negative by Carl Mydans. View full size.

A hobo jungle along the riverfront in St. Louis, Missouri. March 1936. Medium format nitrate negative by Arthur Rothstein. View full size.