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barrysloatePeter is correct on all three. DiMaggio's first appearance on any baseball card was his Zeenut, but since he played in the PCL it is not considered his major league rookie.
The R312 is his first appearance as a member of the Yankees, but due to its size and paper stock not everyone considers it a baseball card.
His first appearance on a nationally distributed baseball card was 1938 Goudey.
And I didn't even participate on that other train wreck thread.