I'm way into this too... the hardest ones in terms of "career contemporary" status are, as some of the prior posters have alluded, the Negro league players and the 19th Century people. Some of the non-players are also either non-existent in career contemporary cards (Marvin Miller) or very scarce (Umpires McGowan and Evans come to mind). This project can require stretching the definitions of the word "card" in order to find something for certain subjects....
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