In September of 1983 I had a rare opportunity to spend two weeks at a Permaculture Design Course by Bill Mollison. It occurred to me that not everyone had such an opportunity. In an attempt to make that course available to everyone I took professional recording equipment with me. Much editing later, I worked it into a set of audio cassette tapes. I'm now happy to report that it is available as an MP3 set on DVD. You can hear short samples to determine the quality of sound. (The whole set is over 2500Mb, so samples will be relatively slow to download on dial-up connections.) https://www.permacultureplants.net/Audio/audio.htm Someone commented recently on this forum that Geoff Lawton listens to Mollison tapes in the car. This is the set he has.