The Tolkien Collection

Notes
It is uncertain exactly which combinations of editions were issued in this set, however it seems likely that at least two variants were issued:

Variant 1
The Hobbit – State 1
Farmer Giles of Ham. Tom Bombadil – Unwin Books
Tree and Leaf. Smith of Wootton Major. Beorhtnoth – Unwin Books
The Fellowship of the Ring – Unwin Paperbacks
The Two Towers – Unwin Paperbacks
The Return of the King – Unwin Paperbacks

Variant 2
The Hobbit – State 2
Farmer Giles of Ham. Tom Bombadil – Unwin Paperbacks
Tree and Leaf. Smith of Wootton Major. Beorhtnoth – Unwin Paperbacks
The Fellowship of the Ring – Unwin Paperbacks
The Two Towers – Unwin Paperbacks
The Return of the King – Unwin Paperbacks