14.

Dr. Dennis McKenna has conducted research in ethnopharmacology for over 30 years. He has taught in the Center for Spirituality and Healing at the University of Minnesota.

The Brotherhood of the Screaming Abyss:https://www.amazon.com/gp/product/B00A8KWLYK/ref=dbs_a_def_rwt_hsch_vapi_tkin_p1_i0