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Daniel Mengden, free to be himself, flourishes with the Oakland A's
What are the best mustaches in Oakland A's history? - Athletics Nation
Is there a religious reason for baseball players to grow long beards? - Quora
What are the best mustaches in Oakland A's history? - Athletics Nation
Melnick: A young boy, a new game, and a larger than life star - The Athletic
Getting To Know: A's Pitching Prospect Daniel Mengden – A's Farm
Dugout Tales – Page 2
The best sports mustaches of all time
Who is the only Major League Baseball (MLB) Hall of Famer who sported a handlebar moustache during his playing days? - Quora
What are the best mustaches in Oakland A's history? - Athletics Nation
2022: Play Ball — Bringing the great American pastime home by MediaNews Group Targeted Products - Issuu