You might like to consider this on-line guide to primary sources (materials from or directly related to the past).
It is free for libraries, schools and educators world wide and links to more than 100,000 sources at national archives, libraries, universities and government web sites.
It has an alphabetical subject index
http://www.awesomestories.com/fast_find/index.shtml of more than 325 pages, including listings of video clips,
You just have to request a free membership using this form.