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PaulHe is in the '41 Double Play set, but obviously it's a two player card not a single player card. He's also in the 1939-46 Salutations Exhibit set. As far as I know, no one has been able to determine the specific years in which any particular player was issued in that Exhibit set. The Leaf set is actually from 1949, so I think the 1948 Topps Magic Photo cards of Boudreau (he has two -- a portrait and an action photo) are also earlier than the Leaf.