Interview with John Olerud - Washington State University Athletics
Uni Watch - History of headgear in MLB Alex Torres - ESPN
The Henderson/Olerud Story: Three Adaptations
Timeline: John Olerud's Baseball Career, Washington State Magazine
Why is John Olerud wearing a batting helmet while fielding his position? - Quora
John Olerud: Remembering a Forgotten Mariners legend
John Olerud : Owner of Best Mets Season Batting Average & All Time on Base % (1997 - 1999)
John Olerud : Owner of Best Mets Season Batting Average & All Time on Base % (1997 - 1999)
John Olerud : Owner of Best Mets Season Batting Average & All Time on Base % (1997 - 1999)
Why is John Olerud wearing a batting helmet while fielding his position? - Quora
John Olerud : Owner of Best Mets Season Batting Average & All Time on Base % (1997 - 1999)
Uni Watch - History of headgear in MLB Alex Torres - ESPN
What MLB player in the 80s wore a batting helmet in the outfield because he was once hit by a D battery? - Quora
Uni Watch - History of headgear in MLB Alex Torres - ESPN