Forgotten Cardboard Heroes
CNN - McGwire's 70th home run ball sells for $3 million, including commission - January 13, 1999
This Day In Baseball July 10 - This Day In Baseball
The Guy Who Caught Mark McGwire's 70th Home Run Ball Sold It for $3M Because McGwire Refused to Meet Him
Mark McGwire's 70th HR Ball Once Sold for $3M and Is Now Valued at $250-$400K, News, Scores, Highlights, Stats, and Rumors
Mark McGwire's 70th home run ball -- once sold for over $3M -- may be worth just $250K now
Upper Deck – SABR's Baseball Cards Research Committee