Trust in serendipity to bring you the information you’re looking for while doing research. Once you start looking, you’ll be surprised how often it will fall right into your lap. Sources include TV documentaries, newspaper articles, blogs, a random conversation, or whatever.
Keep your eyes open! No matter how weird the subject, the information is out there somewhere. Somehow the Universe does a great job of delivering it in the strangest ways. Keep your eyes and ears open. The other day I found an old program I’d recorded months ago on my DVR that fit in perfectly with something I was researching for my current WIP. Once you make up your mind to find it, you will.