Recently I found a wonderful tool for research at snagfilms.com. You can access free documentary films to view from this site. I downloaded a free app that allows me to view films on my iPad, but you can view them on a computer as well. I tried the site tool “movie matcher” that allowed me to narrow my search. I was interested in the history of the “go green” environmental movement in the U. S. (you can also find Canada, UK and international documentaries using this tool), so I clicked on “go green” and “history” and the tool located six results for me. This might be a hit or miss way to research something you want to write about, but if you like to get your information via film rather than via reading, it might be worth a try as a research aid.