Discovered by a frequent contributor and source of expertise without whom the blog would have a lot more inaccuracies and mistakes. A big public thanks for that. Now, we know where the 1974/5 J.Fish cartoon cover came from. If anyone knows of any further titles, do let me know.
As Billboard wrote in 1974 that “jazz is the genre that seems to be bootlegged the most” but I will leave that field to someone else to research … or perhaps that’s already been done.