Any of the 1936 issues that are "cards". The Zeenuts are pre-rookies as mentioned previously and anything after 1936 is too late. The R312 is the one most on the fence. Size-wise it's pretty close to the max as far as what I would consider for "rookie card" status, still a little bit smaller than a cabinet card size such as W600's so I could live with it as being a DiMaggio rookie card.
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