Killebrew being the guy on the logo is speculation. He says he was, the creator said he wasn't. No one seems certain.
What is certain is he is the guy on the logo for the Alumni Association.
Another interesting tidbit good for a bar bet or two- Killebrews first appearence in the bigs was as a pinch runner. As wasn't exactly fleet of foot, I'd love to know who it was he ran for.
Harmon never hit 50 HRs in a season. What he did do was lead the majors in HRs for the decade of the 1960s- a time when Aaron, Mays, Frank Robinmson and many other Hll of Famers were in their prime.