Does Zakum drop ACB 10 often?

Well, I do Zak twice every day and I rarely see that book. It's being a long time, but I think in about 14 runs I saw 3 times the book. Btw, you might have trouble getting the book without paying. ACB and TT, I think are the only two books worth to be Sokable. So people tend to loot these and sell them.