Question: Which football hall of fame was the head coach of the 1968 Minnesota Vikings elected to first?

Context articles: 1997 Minnesota Vikings season
Jim Christopherson
Alan Page
1968 Minnesota Vikings season
Bud Grant
Jim Langer
Leo Lewis (wide receiver)
Ron Yary
Jim Young
1962 Minnesota Vikings season

The Minnesota Vikings season was the 37th year of season play for the Minnesota Vikings and the 78th regular season of the National Football League.
 The Vikings finished with a record of nine wins and seven losses.
 Their record was good enough to qualify for a wild card berth.
 In the wild card round against the New York Giants, the Vikings came back from a 22–13 deficit with 90 seconds to play to defeat the Giants 23–22.
 It was their first playoff victory since 1988 and their first under head coach Dennis Green.
 In the Divisional round, the Vikings were defeated by the San Francisco 49ers, 38–22.
James Monroe Christopherson (born February 17, 1938) was an American football player and coach.
 He played professional football for the Minnesota Vikings in 1962 and was the head coach at Concordia College in Moorhead, Minnesota from 1969 to 2000.
 He was inducted into the College Football Hall of Fame in July 2007.
Alan Cedric Page (born August 7, 1945) is a jurist and former professional American football player.
 Page first gained fame as a defensive tackle for the Minnesota Vikings in the 1970s, and embarked on a legal career after retiring from football.
 He served as an associate justice of the Minnesota Supreme Court from 1993 until he reached the court's mandatory retirement age of 70 in 2015.
 Page is a member of both the College Football Hall of Fame (1993) and the Pro Football Hall of Fame (1988), and is considered one of the greatest defensive linemen ever to play the game.
The Minnesota Vikings season was the franchise's 8th season in the National Football League.
 Under head coach Bud Grant, the Vikings won the NFL Central Division title with a record of eight wins and six losses, as they qualified for postseason play for the first time in franchise history.
 The Vikings' first trip to the playoffs ended with a 24–14 loss in the Western Conference Championship Game to the eventual NFL champion and Super Bowl runner-up Baltimore Colts at Baltimore's Memorial Stadium.
Harry Peter "Bud" Grant Jr. (born May 20, 1927) is a former coach and player of American football and Canadian football.
 Grant served as the head coach of the Minnesota Vikings of the National Football League (NFL) for eighteen seasons; he was the team's second (1967–83) and fourth (1985) head coach.
 Before coaching the Vikings, he was the head coach of the Winnipeg Blue Bombers of the Canadian Football League (CFL) for ten seasons, winning the Grey Cup four times.
 Grant is the most successful coach in Vikings history, and the third most successful professional football coach overall (behind Don Shula and George Halas), with a combined 290 wins in the NFL and CFL.
 Grant was elected to the Canadian Football Hall of Fame in 1983 and to the Pro Football Hall of Fame in 1994.
 He was the first coach in the history of professional football to guide teams to the Grey Cup and the Super Bowl.
James John Langer (born May 16, 1948) is a former American football center who played for the National Football League's Miami Dolphins and Minnesota Vikings.
 He is considered one of the greatest NFL centers of all time and a hard working and quick blocker.
 Langer was elected to the Pro Football Hall of Fame in 1987, one of only four Dolphins players to be elected to the Hall of Fame in their first year of eligibility (Dan Marino, Paul Warfield, Jason Taylor).
Leo Everett Lewis III (born September 17, 1956) is a former professional American football player who played wide receiver for eleven seasons for the Minnesota Vikings and Cleveland Browns.
 He is the son of College Football Hall of Fame and Canadian Football Hall of Fame running back Leo Lewis.
 After retiring from active play, Lewis held the position of director of player development for the Vikings from 1992 to 2005.
 At the same time, Lewis wrote, edited and published the Vikings' player and alumni newsletter.
Anthony Ronald "Ron" Yary (born July 16, 1946) is a former professional American football offensive tackle, playing primarily for the Minnesota Vikings and also for the Los Angeles Rams.
 He was elected to the College Football Hall of Fame in 1987 and the Pro Football Hall of Fame in 2001.
 Yary gave credit for his Pro Football Hall of Fame induction to his former coaches, John Ashton (high school) John McKay (college) and Bud Grant (professional).
 He also praised his position coaches Marv Goux, Dave Levy, John Michaels and Jerry Burns.
James Norman "Dirty Thirty" Young (born June 6, 1943) is a former professional American football and Canadian football player.
 Young played running back and wide receiver for the NFL's Minnesota Vikings for two seasons (1965–66), and the CFL's BC Lions for thirteen seasons (1967–79).
 Young is a member of Canada's Sports Hall of Fame, the Canadian Football Hall of Fame, the BC Sports Hall of Fame, and the Queen's University Football Hall of Fame.
 Young's #30 jersey is one of ten numbers retired by the BC Lions.
 In 2003, Young was voted a member of the BC Lions All-Time Dream Team as part of the club’s 50th anniversary celebration.
 In 2006, Young was voted to the Honour Roll of the CFL's top 50 players of the league's modern era by Canadian sports network TSN.
The 1962 Minnesota Vikings season was the second year of season play for the Minnesota Vikings and the 43rd regular season of the National Football League.
 The Vikings finished with a record of two wins, 11 losses, and one tie under head coach Norm Van Brocklin.
 The 2-11-1 record still stands as the Vikings' worst season record by terms of winning percentage, both by today's standards (.179) and back then (.154), where ties weren't counted as games played.
 The Vikings have won at least three games in every season since.