A rather interesting ad featuring Mark McGwire from 1999 : r/baseball
Hochman: Mark McGwire's 70-HR season, 25 years ago, through eyes of opposing pitcher and STL native
Mark McGwire - Wikipedia
MLB home run fever: Five more crazy facts
Mark McGwire becomes the fourth major leaguer to hit a home run over the left field roof at Tiger Stadium - This Day In Baseball
Topps signs Mark McGwire to autograph deal - Beckett News
Mark McGwire Facts
Long Gone Summer' roundtable - How we remember Mark McGwire, Sammy Sosa and HR race of '98 - ESPN
1998 Major League Baseball home run record chase - Wikipedia