Hey Eric,
Here's a link for Minglewood @ Duke University on 4-12-78. Some good close up shots of Bob's guitar technique for this song. Check out other songs from this show on youtube. At some points the camera shots are right there on the guitars and it's like Jerry and Bob lessons from the dudes themselves!
Good Pickins'
G. Dad
http://www.youtube.com/watch?v=zRSwF0Zg9Ko