How the hell does one gain access to a metric fuckton of white papers?
Calhoun: The NPS Institutional Archive
National Defense University Digital collections
Homeland Security Digital Library
Also? Collecting syllabi of interesting courses and doing all the readings: often people post content you can't find anywhere else.
TL;DR: Do a search on <keyword> + "filetype:pdf". Using individual researchers' names (and email addresses, known associates, etc.) as part of a keyword dragnet will get you into some surprisingly interesting places, too. Once you start down any given rabbit hole, there's no telling where you might end up. Don't forget to use Google Translate and the international sites to search in Russian, Chinese, Arabic, Farsi, Korean, etc.
Other Anon-related topics I might start as a thread sometime if I can find compelling enough links to back me up. Except the questions about me, that would be retarded. lol