History

Ghosts of the Gridiron - Information on early professional teams in the Philadelphia area such as the Frankford Yellow Jackets, Pottsville Maroons and Philadelphia Quakers. Team histories, images, schedules, statistics, and period news articles.
www.geocities.com/ghostsofthegridiron/

The Helmet Project - Documents how the helmets for each team of the NFL, NCAA, NAIA, CIS, NFL Europe, Arena football, CFL, as well as defunct professional leagues, have changed over the years, as well as any interesting anecdotes about each.
www.nationalchamps.net/Helmet_Project/