letter
- https://www.dead.net/archives/1975/clippings/letter-dead-heads-3
- https://www.dead.net/archives/1975/clippings/letter-dead-heads-5
- https://www.dead.net/archives/1975/clippings/letter-dead-heads-6
- https://www.dead.net/archives/1976/clippings/steal-your-face-thank-you-letter
- https://www.dead.net/archives/1977/road-trips/road-trips-vol-2/sour-note
- https://www.dead.net/archives/1987/clippings/touch-grey-video-letter-page-2
