Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Dennis Ray Nelson (born February 2, 1946 in Kewanee, Illinois) is a former professional American football player who played tackle for seven seasons for the Baltimore Colts and the Philadelphia Eagles. American football is a sport played between two teams of eleven with the objective of scoring points by advancing the ball into the opposing team's end zone. Known in the United States simply as football, it may also be referred to informally as gridiron football.