I don't know if anybody wants to take this off of my hands, but here's a link to a 1980 educational short film on school bus safety called Bus Nut.

http://www.youtube.com/watch?v=4tnUZSyMKMs

The movie was produced by the Pennsylvania Department of Transportation, and features a circa 1979 International Harvester S-Series school bus, and a few vintage 1960's and 1970's background vehicles as well.