Rare Recipe Books....Follow

I haven been doing a lot of tradeskilling lately and managed to get my toon up to a lvl 35 sage.

I usually buy the advanced recipe books from the broker and have had no problem, up until this level,finding the rare books.

However, i couldn't find any of the lvl 35 to lvl 39 rare books for sages after many days of watching the brokers. I tried to search on the major eq2 websites for info on where i can get these books from mob drops or quests, but no such info exists.

Please help me find these books ^_^

Thanks

Mubaic
LvL 36 Conjurer
Butcherblock Server

I have Advanced Sage Volumes 35 and 38 on my sage, so they exist. I must have gotten them from drops, although I can't remember where or how.