Roosevelt signed book

My father is the President of the local History society in town. For many years the members knew of this book signed by the 26th President. According to the number printed and signed there must be 500 copies of his autobiography. What I would like to know, is it real? Plus who would be a good dealer to deal with to get the money for it. The book is falling apart and apparently the Historical Society could use the money more than the book....any ideas plus logical appraisals would be much appreciated. BTW it is a photo taken of the cover page. I did not scan it on the computer.