Ken Griffey Jr. Minor League and Pre-Rookie Card Guide, Gallery, Details

How Ken Griffey Jr.'s rookie card became No. 1 for Upper Deck - ESPN

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Ken Griffey Jr. Minor League and Pre-Rookie Card Guide, Gallery, Details

Ken Griffey Jr. Baseball Cards: The Definitive Guide – Wax Pack Gods

Ken Griffey Jr. Rookie Card Guide, Top RCs, Minor League Cards

On Aug. 31, 1990, Ken Griffey Jr. and Sr. became the first father-son teammates in MLB history

14 Ken Griffey Jr. Minor League and Pre Rookie Cards – Post War Cards

14 Ken Griffey Jr. Minor League and Pre Rookie Cards – Post War Cards

Ken Griffey Jr. Minor League and Pre-Rookie Card Guide, Gallery, Details