Tolkien (1981) includes some details and elaborations about the stories which are not found anywhere else, and Pictures by J. Of these, The Silmarillion and The Children of Húrin consist of a single narrative edited together from Tolkien's texts, while the rest are collections of Tolkien's material (with commentaries and notes), ranging from complete narratives to early and new drafts, to essays. Only the first three were published during his lifetime the rest were published posthumously by his son and literary executor Christopher, except The History of The Hobbit which is by John Rateliff and The Nature of Middle-earth by Carl F.