Historical clue formulations

• 1920s-'40s baseballer with a retired "4" — 2012-01-19
• Hitter of 511 career home runs — 2012-01-03
• Youngest Hall-of-Famer (at age 22) to hit 100 home runs — 2010-12-09
• 1936 N.L. leader in slugging percentage — 2008-01-25
• Giant among Giants — 2003-05-30
• Member of the 500 home run club — 2001-07-16
• He wore "4" — 2000-09-16
• His "4" was retired — 1999-09-05
• Giant slugger — 1994-09-18