The Doomsday Clock
Little history before The Last War and even details of The Last War are very scarce. Few books survived the move from west to east and the few surviving books are locked in the special collections of only the largest of libraries. Even with the few books that remain, little history of the world before remains with only very vague recollections of unknown events survived.
Any books the elves had of pre-war history they took with them when they exiled themselves.