 | | Helmet Hut |
| Evolution of American football helmets. Includes pictures. |
| http://www.helmethut.com/ - Added: 23-Sep-05 |
| MR: 6 |
|
 | | Professional Football Researchers Association |
| History of professional football. Information on players, teams, leagues, games and stories from various professional leagues. |
| http://www.footballresearch.com/ - Added: 23-Sep-05 |
| MR: 6 |
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