This is a 10 hour weekend workshop given by Terence McKenna in Boulder, Colorado May 29-31, 1992.
Recorded lectures and discussions like this one are a valuable resource for education and should be taken seriously. Luckily there are dedicated people out there who help to preserve this treasure. Like the alchemical archives, a vast collection of lectures by Terence McKenna and others.
Terence McKenna — Search For The Original Tree Of Knowledge, 1992