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runscottThey were published only in 1910 and 1911, and were offered for a nickel by the Bull Durham tobacco company. Although more difficult to locate than Spaldings, there was one on ebay this week (with a cover) and I see them in major auctions 2-3 times per year. They usually sell for about 2-3 X what Spaldings go for. Very colorful covers and very similar format to the Spalding guides.
Bob Crestohl sells a guide that has these and most of the other t206-era publications listed, but it's old and the prices are out of date - still, a handy item for guide collectors.