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.
By creating a free account on Shorpy you can share your own vintage photographs. Visitors to the site are particularly interested in images from the dawn of photography to the 1940s. Best of all, becoming a member is free!