The Adventures of Tom Bombadil actual translation from the "Red Book of Westmarch", and contains some background information on the world of Middle-earth that is not found elsewhere: e.g. the name of the tower at Dol Amroth and the names of the Seven Rivers of Gondor. There is also some fictional background information of those poems, linking them to Hobbit folklore and literature and to their actual writers (some of them are ascribed to Samwise Gamgee). The book uses the letter "K" instead of "C" for the /k/ sound in Sindarin (one of the languages invented by Tolkien), a spelling variant Tolkien used many times
Meriadoc Brandybuck Took (as Sam said at the Field of Cormallen, Merry was three inches taller than he ought to have been). In the Brandybuck family tree as it appeared in the First Edition, the name of Merry's wife was not recorded. In a revision made in 1966, the name of Estella Bolger, sister of Fredegar, was added in this role; the revision was initially made in some editions but not in others, as described in the "Note of the Text" by Douglas Anderson which is prefaced to recent editions. At the same time, Tolkien added Estella to the Took family tree,