philadelphia
- https://www.dead.net/features/road/next-week-phil-philly
- https://www.dead.net/archives/1970/clippings/article-rolling-stone-0
- https://www.dead.net/archives/1972/photos/grateful-dead-spectrum
- https://www.dead.net/archives/1974/clippings/philadelphia-civic-center-program-1-2
- https://www.dead.net/archives/1974/clippings/philadelphia-civic-center-program-2-2
- https://www.dead.net/archives/1979/road-trips/road-trips-vol-1/grateful-dead-walk-again-spectrum-stage
