June 3, 1967, Killebrew hits a 520-foot homer
Metropolitan Stadium / Minnesota Twins / 1961-1981 - Ballpark Digest
June 3-4, 1967: Harmon Killebrew blasts two tape-measure home runs on consecutive days – Society for American Baseball Research
September 30, 1981: Twins close Metropolitan Stadium with a loss – Society for American Baseball Research
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Blast a Reminder of a Time When the Stars Were the Show - The New York Times
June 3, 1967, Killebrew hits a 520-foot homer
Harmon Killebrew, Baseball Wiki
Harmon Killebrew Stats & Facts - This Day In Baseball
Passing of a legend, Local News Stories
Harmon Killebrew, Wiki
Lost for Words. The phone rang three times before a…, by Don and Petie Kladstrup, Almost Home
Harmon Killebrew (Twins) hits a homerun off Don Drysdale (Dodgers) (1965 World Series Game 4)
A look back at Harmon Killebrew - Royals Review
Thom Henninger