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On the back of this photo is written: "L.B.M."
Since this photo was taken at the same time as the one of my dad standing by this log school house, Jefferson Co., MO ca 1931, and on other photos I have seen him abbreviate "Mothershead" by writing just as "M", I am assuming this is L. B. Mothershead, possibly Lee Mothershead. Now, if only I could  prove it  :-)