This was bought at a estate sale. The previous owner was friends with Karl Rove and she told me that Mary B signed her book.  She was friends with Mary B and she signed this book for her.   The autograph is not authenticated.  I can only find a couple of Mary's with the Bush family.  Aunt Mary and Mary Bush.   The lady that I bought this from had friends in the Bush administration is all I got out of her.

Appears to be solid but you would have to get it authenticated.