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:

Kenneth Hall, a Tennessee Valley Authority worker, eating lunch. Photograph by Arthur Rothstein, June 1942. View full size.

Movie theater projectionist somewhere in the Washingon, D.C., area. Photograph by Marion S. Trikosko, 1958. View full size.

A Portuguese dory fisherman rows his boat out at 4:30 a.m. leave for the banks off Cape Cod. Photograph by John Collier, 1942. View full size.

Children get milk or tomato juice after their nap at the nursery school at Queensbridge housing project in Queens, New York. Photograph by Arthur Rothstein, June 1942. View full size.

Children wash before lunch at the nursery school at the Red Hook housing project community center in Brooklyn, New York. Photograph by Arthur Rothstein, June 1942. View full size.
Using some of the photos posted on Shorpy, reader Dale Caruso put together this touching audio slide show on child workers at the turn of the century. Thanks for sharing Dale.