The Invisible Landscape, Terence McKenna and Dennis McKenna (1975)
This book begins with a decent introductory discussion of shamanism, and includes a concise articulation of the limits of materialist science. Otherwise it is considerably worse than Terence's lectures. I hoped to find more explicit clarity about his wave theory of time; i didn't find that, despite the copious quotation from scientific discourse. The McKennas provide insufficient context for most of the material they cite, which for a non-scientist like me means that i'd have to take it on faith that this material shows what they say it does. Weird and occasionally stimulating, but overall tedious and unconvincing.