promotional
- https://www.dead.net/archives/1971/photos/grateful-dead-lp-promo-display
- https://www.dead.net/archives/1971/photos/grateful-dead-lp-promo-display-0
- https://www.dead.net/archives/1971/photos/grateful-dead-lp-promo-display-1
- https://www.dead.net/archives/1971/clippings/warner-brothers-letter-promo-display
- https://www.dead.net/archives/1971/clippings/billboard-article-grateful-dead-lp
- https://www.dead.net/archives/1971/clippings/wb-publication-circular-page-1
