Which Computer Books For Prisoners?

Brian D. writes "I've recently begun working with a group that sends books to prisoners in federal and state prisons. We try to match their requests as well as we can. One request that we consistently have trouble filling is for computer books. This is not for lack of books, but because the prisoners' requests tend to be vague and their computer resources are obviously severely limited. Keep in mind that we send prisoners all types of books — from gardening and landscaping to cooking and sailing — about topics they don't have the resources to experiment with. With basically one shelf devoted to books on computing, what types of books should I tell them we should keep? What are the best types of books to send a prisoner who requests a book on 'computer repair?'"