Cephalopedia:
An encyclopedia written about and by cephalopods.
The earliest portion of work was recorded by the nautilus line, very formal and poetic.
There are two divergent and more freeform writing styles: octopod and squidic.
While there has been little acceptance of it, a smattering of fiction is also extant, mainly dystopian stories describing the desire to fight back against mechanized predation and ocean pollution.