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Mark McGwire Trading Cards: Values, Tracking & Hot Deals
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1989 Upper Deck: A Card Set that Changed the Game - GoCollect
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Autographed Mark McGwire MLB Trading Cards, Autographed Trading
![1989 Upper Deck #300 Mark McGwire Baseball Card](https://img.bleacherreport.net/img/slides/photos/004/520/019/56a0254069c5a8a60aae4ad448fe03c6_crop_exact.jpg?w=2975&h=2048&q=85)
Sports Cards: The Most Iconic MLB Rookie Card for Every Team
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1989 Upper Deck #300 MARK McGWIRE Iconic Card x Lot 51 Count @FC4
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25 Most Valuable 1989 Upper Deck Baseball Cards - Old Sports Cards
![1989 Upper Deck #300 Mark McGwire Baseball Card](https://img.bleacherreport.net/img/slides/photos/004/520/023/hi-res-5e7b6aef80bbff39df6bc1d853476c31_crop_exact.jpg?w=2975&h=2048&q=85)
Sports Cards: The Most Iconic MLB Rookie Card for Every Team
![1989 Upper Deck #300 Mark McGwire Baseball Card](https://live.staticflickr.com/65535/52716473238_68491195cf_b.jpg)
Oakland A's Price List - Supercollector Catalog
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Mavin 1989 Upper Deck - Mark McGwire - #300 - Oakland Athletics
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Mark McGwire Trading Cards: Values, Tracking & Hot Deals