I am not sure, but probably the book is not on line. I got my info from the tngenweb site for Obion Co. under the military section. Someone had extracted info on the Civil War soldiers from Obion Co. from several resources.
These TN county history books were published several years ago from info submitted by family members. Personally I do not think it would be worth the big money for the book....I think what I wrote is all that was mentioned about the hanging. You could try to inquire if the book is available by writing the Obion County Historical Society, P.O. Box 241, Union City, TN 38261. These books were sold for around $50-60 when they were first published.