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Frank WakefieldLobertCollector is telling you correctly.
And as for Mathewson, try Ray Robinson's Matty: An American Hero... affordable copies on ABE.
I've not read Michael Hartley's book, Christy Mathewson.
A truly GREAT baseball book, realistically in the top 3 baseball novels, is The Celebrant: A Novel, by Eric Rolfe Greenberg. If you're interested in Mathewson and his times, this is a must read for you. I'd read the 'other' great baseball novels before I read The Celebrant, and when a couple of people told me how great it was I discounted that, knowing it couldn't compare to the novels popularly considered 'best'. I was mistaken. If I could only have 10 baseball books on that desert island, this would be one of the ten.