How many teams have won the Super Bowl? - Quora
Bud Grant, Longtime Minnesota Vikings Coach, Dies at 95 - The New York Times
In the '60s, the Minnesota Vikings chartered an Explorer post
Minnesota Vikings Football 1967 Vintage Sports Memorabilia for sale
Bears–Vikings rivalry - Wikipedia
Vikings' 1967 draft: Three guys picked a great class out of a hospital room
1966 NFL season - Wikipedia
Minnesota Vikings By The Numbers: #87 - Daily Norseman