I've spent the last ten years or so revising a book originally written by my great-grandfather in 1916. He held the publishing of the book until early 1919 as several members of the family were killed during the first world war and he wanted to include their stories.
In 1929, his cousin enlarged the book with corrections and republished it.
I have taken both books and done the same. It is considerably larger than the 1929 edition.
It is possible to copyright my release of this work? If so how do I need to go about it.