I agree with the comments about getting young kids interested in vintage cards. You have to start with building a passion for the game and then for history. I don't think you can just go straight to the cards. It can be encouraged but not forced.
I also agree with the books recommended, including Strange But True, but also the newer books by Gutman that bring baseball cards and history to life for kids. Gutman also has one on Jackie Robinson and Shoeless Joe. My son has these. I confess to reading them myself but they are designed for kids.
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