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HarryI love vintage baseball books, but I have never owned that one.
Looking through my auction catalogs and notes from the last several years, I came across six copies alone. I believe that they are all different. Those, along with the five that you noted and the one that Jay has makes 12 right there.
I am sure that there are several more in private sports collections and others in the hands of book collectors and who know about other libraries or museums.
I would guess that there are minimally 25+ in existence.