advertising
- https://www.dead.net/archives/1971/photos/grateful-dead-lp-sales-display
- https://www.dead.net/archives/1971/clippings/billboard-article-grateful-dead-lp
- https://www.dead.net/archives/1971/clippings/warner-brothers-advertising-letter
- https://www.dead.net/archives/1971/clippings/warner-bros-advertising-letter-page-2
- https://www.dead.net/archives/1972/clippings/promotion-72-1-5
- https://www.dead.net/archives/1972/clippings/promotion-72-2-5
