I used to get AB1 all the time on Oslya, and AB2 at South Pole. However, drops of AB's and Clear Devils Pieces seems to have gotten very screwed up. I haven't looted a book in weeks. And ony about 20 pieces over the last 4 weeks. Keep in mind that is with 4 chars remoting about 16hrs/day.

Spoiler:

Level 156 fire
T4
90% of the laws are made because of 10% of the people.