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.
College and high-school football a century ago, when the helmets were leather and sportsmanship was the name of the game. For maximum impact, use Full-Screen mode at 1080p resolution (click "Play," select 1080p, then click the icon).