Unique

It is evident, however, that the biblical books follow their own path as far as content and form is concerned. Unlike the ancient Near Eastern parallels, the prophetic books of the Bible develop into a literary genre of their own that was handed down over the centuries and constantly re-worked at a literary level. As to their content, they differ from both their ancient Near Eastern parallels and their own historical Israelite-Judean roots.—The Prophets of Israel, page 148

<idle musing>
As I've said before, he's a good bit more skeptical than I am about the amount of material in the prophetic books that goes back to the original prophet. But aside from that, his observation is correct.
</idle musing>