THE NEW YORK TIMES, September 19, 1920  Page 21 contains a very significant--albeit modestly presented--report on the founding of the NFL, headed: "Thorpe Made President" "Famous Indian Athlete Elected Head Of Pro Football Association". The report is datelined "Canton, Ohio, Sept. 18", & begins: "Jim Thorpe, famous Indian football player,  and coach of the Canton Bulldogs, a local professional team, has been chosen head of the American Professional Football Association, the only professional football organization in the country.....". The report concludes with an interesting line: "A decision was reached to refrain from luring players out of college for the professional game."
Obviously a humble beginning for a league that has become a major business, and a sport with a tremendous audience.
The complete issue in nine sections, being the Sunday edition. Minor binding slits at the blank spine margin, great condition.