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Is the Lord of the Rings one of the best and most complete literature pieces of the 20th century or what?
No, it is by no means in and of itself complete. Why does Bilbo refer to it as his old ring? You need to read The Hobbit. Most of the background of Middle Earth is found in several other books.
Great books to be sure butt not a fully complete story as they are only a part of a larger mythology.