Thunderbird Films were a Los Angeles based film distributor, who released loads of trailer reels usually on 200ft or 400ft with multiple trailers on each reel.
The listings are a very varied selection, of both super 8 & 16mm. In fact mentioned in the listings that all titles that are in 16mm are to be available in super 8 too.
Check out the listings. Not sure if all the titles were released exclusively by Thunderbird Films, or other distributors at the time also released them too.
If you have anymore information or flyers from Thunderbird Films please contact The Reel Image.