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.

Nov. 1941. Etna, Pennsylvania. "Blast furnaces and ore at the Carnegie-Illinois Steel mills." View full size. 4x5 Kodachrome transparency by Alfred Palmer.
Most of these photos can be described as "documentarian." This is the first one I've seen that has a really interesting composition - that I'd be willing to hang on my wall!
These were gone by the time I was born in 1961. My grandfather was a blacksmith for Spangs steel mill in Etna. I believe these may have been along the banks of the Allegheny River. Etna is about 8 miles northeast of Pittsburgh.