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Dan BrettaI have a 1920 Chillicothe Business College postcard with Hubbard pictured on it. He is seated 2nd from right in the middle row.
![1920 Chillicothe Postcard -Cal Hubbard 2nd from Right Middle Row](http://i22.photobucket.com/albums/b331/nudan92/Vintage%20Baseball%20Memorabilia/chillicothe.jpg)
I believe your photo also pictures Hubbard.
edited to add: Most biographies of Hubbard never mention Chillicothe, but he did indeed play there. Here is a link that gives that information.
http://www.livingstoncountylibrary.org/History/County/1981/1981sports.htm