I found 13 on my first, main guy, and now I'm level 9 on my second guy, and posted this on the official Rift Forums. A rep said there are 14 books, I collected 13 on my first guy and have the same ones now on this guy.
The list is: Acacia Zardonis: Nightblade, City Record of Ardenburgh, Durnes: Ranger, Elementalists, the First Mages, Journal of Zareph Mathos, Niyol Cliffswind: Sentinel, Nysyr: Inquistor, On Nydra, the Warlock, Pynnious Rothmann :Pyromancer, Talos Roda: Purifier, Vachir Altman: Champion, The Unholy Blight: Reavers, Veseslav: Assassin.
Can anyone tell me the name of the 14th or where to find it? I logged out of my guy after searching about 3 hours now for it. Sorry, if you aren't obsessive compulsive you wouldn't understand. I've searched the whole town, and the whole battlefield. I went up on Orphiel's ledge and nothing, I searched the whole Rift area without battling the mobs for the quest and came back to camp then.