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.
"Gas tank at 26th & G." The city gas house and holding tanks ("gasometers") in Northwest Washington near the current location of the Watergate complex. The intersection in the photo (seen earlier here) is New Hampshire (middle left) and Virginia avenues. Harris & Ewing Collection glass negative. View full size.