1989 Upper Deck Baseball Cards – 28 Most Valuable – Wax Pack Gods
I Remember Ken Griffey Jr.
Ranking today's MLB stars by their Griffey Factor - ABC7 Los Angeles
1989 Upper Deck #1 Ken Griffey Jr. Rookie Card (3) - TonyeTrade
Ken Griffey Jr Checklist - Supercollector Catalog
The Changes Sparked by the 1989 Upper Deck Set
Secrets of the 1989 Upper Deck Baseball Checklist Revealed
Why are rookie cards considered valuable? - Quora
PSA 10 GEM MINT 1989 UPPER DECK KEN GRIFFEY JR #1 ICONIC ROOKIE