Your best bet is probably to individually type in the Hall Of Famer names and look for either certified signed cards (if more common) or use (or buy, cheap) a Mark Allen Baker Hall Of Fame baseball autograph exemplar book (not all signatures in the book are of the players, but some clubhouses and the 19th Century players are false). There is not in my opinion one definite place to get all this information and I guess you have to look through different sources to get all the information that you will need. Heritage (ha.com, but you must be registered lets you look at past auctions). Hope this helps and good luck!
Dan
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