The Red Book of Westmarch was begun as a Diary by Bilbo with important notes of his unexpected trip with the Dwarves. Because the Ring was found, and it became imperative that it be destroyed, this journal became a document of historical importance.
Notice that there is more than one author for this book. Bilbo, Frodo, and Sam are mentioned. Credit is also given to the accounts of their friends, the learning of the Wise, and extracts from the Books of Lore.
Frodo tells Sam that he is finished and that the last pages are for Sam. What did Sam add to it? Did anyone else have a hand in writing any of the facts, tales, songs? Did Sam hand the book down to anyone else? Were there any duplicates of this book? Did children use it as a history book in class?
In Real Life, do you think this was the way history records were kept in the past? Or were they handed down as tales, which were embellished by each new storyteller?
"You stand between me and my lord and kin. Begone, if you be not deathless! For living or dark undead, I will smite you, if you touch him!"