?
You can find lots of books in Apocrypha. I do not have all the black books yet, but my question would be why could they not include the book a lot of us missed Holdings of Jarl Gjalund, that would have been helpful. Of course it could be there yet, but I am starting to think not, the books seem to be repeating themselves too much. I found more than one copy of Cleansing of the Fane.
isn't that book always on the desk in dragonsreach? pretty hard to miss imo

I think you're right about apocrypha only carrying certain books...i have about 6 copies of each poison song volume