There are only two spellbooks in the Institute of Illusory Learning (ILL). The library is pretty small but you'll need at least guild max adventuring.direction to get to the books.
Ye Booke of Polymorphe:
Booch's Extremal Polymorphism
Stacklady's Morphic Resonator
Yordon's Extremal Extension
Spelles of thee Oryent:
Al'Hrahaz's Scintillating Blorpler
Pragi's Lost Gaze