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:
April 1917. "Daily inspection of teeth and fingernails. Older pupils make the inspection under the direction of teacher who records results. This has been done every day this year. School #49, Comanche County, Oklahoma (near Lawton)." View full size. Photograph by Lewis Wickes Hine. Alternate version here.