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:
July 8, 1926. Washington, D.C. "Miss Hattie E. Alexander & Mrs. S.A. Carlin testing serum." View full size. National Photo Company Collection. [Update: A few years after this photo was taken, Hattie (on the left) would become Dr. Alexander. As president of the American Pediatric Society in the 1960s, she was among the first women to head a major medical association.]