A film called "messing about in boats" has a lot of very old film from Georgie White's early days and does a good job of telling the history of Grand Canyon rafting. I thought it was on YouTube but can't find it now. It's around, you just have to hunt for it.
Also, I have some pretty good for (Super
films from the 70's, mainly of Dolores. Including my most embarrassing "how not to run Snaggletooth" clip that I posted around here somewhere.