Middle-earth Universe is a 6-book series first released in 1883 with contributions by J.R.R. Tolkien and Francis Ledoux.
1883 • 1 Reader • 538 pages • 4
1985 • 127 Readers • 304 pages • 3.7
1954 • 3,269 Readers • 398 pages • 4.4
1955 • 217 Readers • 1,554 pages • 4.5
1955 • 1 Reader • 1,137 pages • 5
1977 • 943 Readers • 481 pages • 4