Mike Piazza's Hall of Fame plaque mentions his post-9/11 homer
Mike Piazza, Ken Griffey Jr. inducted into Baseball Hall of Fame – Orange County Register
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Hall of Fame Class of 2016
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2012 European Championship – mlbblogger
Mike Piazza, Ken Griffey Jr. inducted into Baseball Hall of Fame – Orange County Register
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Baseball Hall of Fame: Ken Griffey Jr., Mike Piazza are Cooperstown odd couple - ESPN
Ken Griffey Jr., Mike Piazza inducted into Baseball Hall of Fame - ESPN
Every Baseball Hall of Fame class, ranked