The Red Book Of Westmarch

[Boromir88]

So you're saying that the three volumes are other things bilbo wrote?

Yes, but I could be wrong.

I'm wondering if that's saying that the three other volumes are My Unexpected Journey. There and Back Again. And What Happened After.
Adventures of Finve Hobbits. The Tale of the Great Ring, compiled by Bilbo Baggins from his own obswervations and the accounts of his friends What we did in the War of the Ring.

It's possible.