Nationals Park Makes Strides to Promote Baseball History - Sports Collectors Digest
History of the Seattle Mariners - Wikipedia
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August 31, 1990: Ken Griffey Jr. and Sr. get back-to-back hits in father-son debut with Mariners – Society for American Baseball Research
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Ken Griffey Sr. & Ken Griffey Jr. Signed LE Mariners Back to Back 24.25x30 Lithograph (JSA COA)
2000 Topps
The Junior Junkie: the Baseball Cards of Ken Griffey, Jr. and Beyond: The Secret of 1998 SP Authentic
ONLINE ONLY SPORTS MEMORABILIA AUCTION
Ken Griffey Jr. - Wikipedia