NFL, 1966 and AFL, 1966: location-maps, with final standings / Plus NFL, 1970: location-map with final standings / Plus a short article on the 1966 agreement which led to the 1970 AFL/NFL merger. «
How the NFL took over America in 100 years
The Agreement - NFL-AFL Merger
24 maps that explain the NFL
American football – Travel guide at Wikivoyage
Short Cuts. The Dictionary of Useful Abbreviations PDF, PDF, Acronym
Reflections on the AFL and its merger with the NFL