Directories for Finding Archives
When looking for archival resources, a lot is going to depend on what you are looking for. Think local to the topic then move toward something larger -- like a concentric circle. Some things to consider as you're getting started:
Archive research take a little more digging and therefore a little more time. Make sure to give yourself plenty of time to dive into the research.
Digital collections of photographs, art, journal entries, and other documents often exist in libraries, historical societies, and museums around the world. To find one, you might try the following google search:
your topic "digital collections" site:.org or site:edu
*Be sure to note any usage rights associated with images or videos that you might wish to use in your film.