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.
http://www.geocities.com/ghostsofthegridiron/

Pro Football Server
Offers : scores : and : standings : for : each : year : in : the : history : of : the : NFL, : the : several : AFLs, : the : AAFC, : USFL, : XFL, : WFL, : World : League : of : American : Football/NFL : Europe, : Arena : and : af2, : and : CFL : through : 2003. : Also : offers : capsule : histories : of : each : league.
http://kitprice.net/football_server/

Professional Football Researchers Association (PFRA)
History : of : professional : football, : including : the : players, : : teams, : leagues, : games : and : stories : from : the : National : Football : League : (NFL), : World : Football : League : (WFL), : United : States : Football : League : (USFL) : and : other : professional : leagues.
http://www.footballresearch.com/

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.
http://www.nationalchamps.net/Helmet_Project/