I've had some success with interlibrary loan for getting theses, and you can also request books or other materials. If you can't find it within the UNC system, you can go to the reference desk at Davis and fill out an interlibrary loan request. It can take several weeks before your material arrives, though, so don't do this if you need it for a project due in three days. If it's at Duke or State, don't use interlibrary loan unless you're really lazy. Just go there yourself and pick it up.
Most companies have a corporate library for their own employees.
These can be excellent sources for certain specialized types of information. I noticed they had every manual ever printed for an Apple computer, and most of the advertisements ever shown on television. I've been in the Pentagon's library, and you can guess what was there. For a local company, you can contact the head librarian, politely explain what you are looking for and why you need it, and then ask to visit. You probably won't be allowed to check out anything, but there's a decent chance they'll let you in.