A lot of this looks really good, well-researched and ahead of it's time.
http://web.archive.org/web/20070117210607/http://coleman300.com/audio.htm
He has a couple of videos on YouTube and I found a seemingly shortened version of his book as a PDF but that's about it.
There is a small pack of 11 PDF ebooks of John Coleman's on myanonamouse.net.
https://concen.org/search/torrent/content?path_op=allwords&path=John+col...
There is definitely a benefit to learning to use the site! Thanks :)