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DavidDave Bushing and Joe Phillips recently published a guide to vintage baseballs ('Vintage Base Balls'). It is short, like a 20 page pamplet, and informative with a price guide. I know that at one point MastroNet was selling it on their site, but I beleive no more. Otherwise, it's probably at sale at Phillip's site at glovecollector.com. I got a free copy in order to review it in my old newsletter, but I think it costs something like $15-20.