I never realized that Willis O'Brien made any films for the Edison Company, but I found this one today on the internet. I assumed (incorrectly) that it must have been O'Brien's first film but he apparently made a couple the year before this. If, by the way, you don't know who he is, O'Brien was the man responsible for animating King Kong and is considered THE pioneer of stop-motion films.
As for "RFD 10,000 BC", it's a silly little film with a rather thin story. Instead, it seems more like a chance for O'Brien to hone his craft--though the story has a few laughs here and there as well as a rather revolting scene where one character is ripped in half. Fortunately, he got better! Cute and a film that fans of stop-motion, O'Brien or Ray Harryahausen (an apprentice of O'Brien) should see. It's available at the Library of Congress' site and can be viewed for free. And, it doesn't matter if you are in the US or not--it's free for everyone.