columbia university
- https://www.dead.net/archives/1968/photos/phil-bobby-play-columbia-u
- https://www.dead.net/archives/1968/photos/mickey-hart-student-strike
- https://www.dead.net/archives/1968/photos/pigpen-student-strike
- https://www.dead.net/archives/1968/photos/bobby-student-strike
- https://www.dead.net/archives/1968/photos/jerry-student-strike
