Why aren't there any books in my prison library?

Solution 1:

Well I accidentally figured this out myself... in the process of trying to reorganize the room (after dismantling everything) I put the sorting desks in the middle of the room and lined the outside wall with the shelves, and I immediately saw books start being delivered from the truck. Once the work shift started, I saw the workers standing behind the sorting desks. While I assumed that the position of the desk mattered (looking at which way the light and items on the desk were facing) but it does -- they need to stand behind the desks, and now they work, and the riots have subsided for the most part -- the inmates are much happier.