There is/are at least one (perhaps 2) books published about the ISB; I got a leaflet advertising one recently (probably from Pigs Whisker Music). Though I cannot find it at present, if anyone is interested I may be able to get hold of it. However if you look for "Incredible String Band" on the Internet and hence find the official websites, you can probably find out all about this. Sorry I have to break off as it is after 2 am.