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Jason Lthat (pre-war or post-war) the first time a player is pictured on a card by himself is a rookie card, unless grouped with 1-3 other players and labelled as a "rookie"
I don't think team cards should count, unless it is the only time the player ever appeared on any card.
Peter C,
just my opinion, but I think that having Jerry Koosman on any card is actually a negative 