The original press kit lists what was available from the studio in 1971. I think someone else here has that.

msycamore found the 1978 reissue trailer a while back. It's no longer online last time I checked, and the poster never responded to inquiries, but I was able to download it. It's 320X188, which seems like an odd resolution to me.

Asked bobgarcia74 about restoring it in higher resolution, (the titles would be easy to recreate) but never heard back. Haven't seen him around here in a long time.