Magazines may include interviews with filmmakers, film reviews, articles on the craft of filmmaking, and other news in the field.
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.