The History of Middle-Earth is a 13-book series with 13 primary works first released in 1983 with contributions by J.R.R. Tolkien, Cinzia Pieruccini, and 2 others.
1983 • 2 Readers • 349 pages • 4
1986 • 8 Readers • 380 pages • 5
1990 • 7 Readers • 476 pages • 5
1994 • 8 Readers • 470 pages • 5
1996 • 12 Readers • 438 pages • 4
2002 • 2 Readers • 400 pages