No, there are 6. To quote the “note on the text” at the beginning of my 1-volume edition:
The Lord of the Rings is often erroneously called a trilogy, when it is in fact a single novel, consisting of six books plus appendices, sometimes published in three volumes.
Each of the common three volumes consists of two books, which should be clearly delineated as such in any copy.
No, there are 6. To quote the “note on the text” at the beginning of my 1-volume edition:
Each of the common three volumes consists of two books, which should be clearly delineated as such in any copy.