I have a JFK Death certificate i found taped to the back of a book called,Ping The Torch. Is this real?

I found the book at an estate sale. The book was signed by the husband and dated 1964 property of. The book also had a JFK newspaper in plastic zip lock bag. The death certificate was taped on the back of the hard cover of the book with strips of scotch tape. Is this an authentic doent? Thank You,Roberto.