Great Facial Hair: A Little Piece of Baseball's Unique Culture - Purple Row
Photos: MLB players with best beards, mustaches, facial hair - Sports Illustrated
Best beards and mustaches for every MLB team
Baseball Card Breakdown: Tim Blackwell's mustache is a sight to behold
The best sports mustaches of all time
Best beards and mustaches for every MLB team
Great year for MLB pitcher mustaches : r/baseball
Best Moustaches in Baseball History
Major League Beards: Best Beards For Every Position in Pro Baseball - Grooming Lounge
MLB Facial Hair Hall of Fame - Men's Journal
Rollie Fingers' mustache, then and now