circular
- https://www.dead.net/archives/1971/clippings/wb-publication-circular-back-cover
- https://www.dead.net/archives/1971/clippings/wb-publication-circular-page-3
- https://www.dead.net/archives/1971/clippings/wb-publication-circular-page-6
- https://www.dead.net/archives/1971/clippings/wb-publication-circular-page-1
- https://www.dead.net/archives/1971/clippings/wb-publication-circular-page-4
- https://www.dead.net/archives/1971/clippings/wb-publication-circular-page-7