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:
September 1908. Gary, West Virginia. "Drivers and Mules in a coal mine where much of the mining and carrying is done by machinery. Open flame on oil headlamps." View full size.
From the Web site of the Pennsylvania Historical and Museum Commission and the Museum of Anthracite Mining in Ashland: