Cards numbered in the mid-60s and 70s in the 1971 Topps set were given over to helps us learn the league leaders in all the major hitting and pitching categories. I love these cards because they often times turn into a 3 Hall of Famers-for-1 card sale.
#64 National League RBI Leaders
#66 National League Home Run Leaders
#67 American League ERA Leaders
#70 National League Pitching Leaders
#72 National League Strikeout Leaders