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Apocrypha
The most prominent feature of Apocrypha, is  the vast number of books that
make up Hermaeus Mora's collection. Giant stacks of books break the
surface of the poisonous sea, numerous shelves that line the halls and
walls are crammed to bursting with ancient scrolls and moldering
journals, heaps of books and papers litter the floors, and even entire
buildings are constructed from twisting stacks of books. These books are
protected and maintained by the Seekers and Lurkers, who make up the
majority of the inhabitants of Apocrypha. (information from Skyrim Wiki)