September 21, 1969: Killebrew's perfect day not enough for Twins

Idaho loses legend, Sports

A history of Minnesota Twins double-digit innings

Harmon Killebrew's Much-Anticipated and Long-Awaited 500th Circuit Clout - Baseball Roundtable

Twins Hall of Famer Harmon Killebrew dead at 74 – Twin Cities

You want strength? You want dignity? You couldn't do better than Henry (or Harmon, for that matter)! – Bulletin Board

Minnesota Twins Take 2 Of 3 From Colorado Rockies

100 Things Twins Fans Should Know & Do Before They Die by Alex Halsted - Ebook

Matt Trueblood - Baseball

Minnesota Twins history, memorabilia in good hands with Clyde the Curator - Sports Collectors Digest

Baseball - A Film by Ken Burns : Mamie Ruth Moberly, Hank Aaron, Bud Abbott, Roger Angell, Arthur Ashe, Red Barber, Mike Barnicle, Victor

Baseball - A Film by Ken Burns

Minnesota Twins Stat of the Day, September 2021

Bill Rigney Archives

September 21, 1970: A's rookie Vida Blue no-hits Twins, drinks their champagne – Society for American Baseball Research