A combined index called The History of Middle-earth: Index was published in 2002, six years after the series was completed.
The book creates a supreme index charting the writing of The Lord of the Rings and The Silmarillion. It also complements the History of Middle-earth series, repackaged to complement the distinctive and classic style of the '"black cover" A-format paperbacks of The Hobbit, The Lord of the Rings, The Silmarillion and Unfinished Tales.