Oh man, I have a small set of betamax tapes here that are pure platinum.
They were picked up down on the coast. It looks like almost as soon as St Helens blew, buddy threw a tape in his VCR and kept feeding it fresh tapes in Beta III mode for the rest of the day and a few more times over the rest of the week. You can spend a whole day watching the live coverage and field reports as the first damage images and ash predictions came in.
Not the kind of stuff you'll find on a youtube of National Geographic video. Unfortunately I contacted all the taped stations and they all refused to allow it to be uploaded anywhere without paying royalties or heavy editing.