The History of Middle-earth
"The Silmarillion" was followed by "Unfinished Tales" in 1980, and "The History of Middle-earth" in 12 volumes between 1983 and 1996. Most of the original source-texts have been made public from which "The Silmarillion" was constructed. In April 2007, Tolkien published "The Children of Húrin", whose story his father had brought to a relatively complete stage between 1951 and 1957 before abandoning it. This was one of his father's earliest stories, its first version dating back to 1918; several versions are published in "The Silmarillion", "Unfinished Tales", and "The History of Middle-earth". "The Children of Húrin" is a synthesis of these and other sources. "Beren and Lúthien " is an editorial work and was published as a stand-alone book in 2017.