How to get Golem Manual back

unfortunately, i deleted the book and i dont know how to get it back.

could anyone help me ?

You have to go to Zinn's Secret Lair to reacquire the manual...find Zinn inside and talk to him. It says to do this in the inventory icon text for the Manual, so I suppose it sucks if you didn't read it before deleting. The lair is in the far west of the falls, behind a collector named...Agrippa Stonehands, I think. Check other threads for the specific location.

gl,
Sid

I know the book have 5 Missions, Is these mission repeatable?

Doesn't seem to be that they are repeatable.

and really, it's not 5 missions, but 3 *R.O.X., P.O.X., N.O.X.* and then finding the lair, which is hardly a mission *just slap on a running build, or even Volfen Blessing, and add M.O.X. to your party and you're good to go if you know where to go*.

OK, once I have the missions/quests, I can toss the Book right? I really dislike the books and the space it takes up. I have the quests, so what do I need the book for?

You can ditch the book after you get the quests, it isn't needed anymore.