My apologies if this has already been posted on here and I did not see it.
The Portal to Texas History, which is supported by North Texas libraries and other groups, has some very cool video from mid-1970s NT football. None of the videos I clicked on has sound.
Here is a link to the full list: http://texashistory.unt.edu/search/?fq=untl_collection%3AUNTADR&start=0
These are the two that stuck out for me:
1975 @ Tennessee - http://texashistory.unt.edu/ark:/67531/metadc272194/
1976 vs. Florida State - http://texashistory.unt.edu/ark:/67531/metadc272165/
I tried to find a video of the Sears Woods kickoff return TD, but to no avail. I could have missed it, but one video stops right before it, and the other literally skips over it and shows the ensuing kickoff that Tennessee received.
Lots of cool video. The website has more than just sports too. About 30 years of NBC 5 footage has/is being digitized for the site.