Robert C Clarke

Robert C. Clarke is Cannabis researcher and Projects Manager for the International Hemp Association in Amsterdam and the author of "Marijuana Botany" and "Hashish!" Mark D. Merlin is Botany Professor at University of Hawai i at M?noa and author of "On the Trail of the Ancient Opium Poppy."

Robert C. Clarke is Cannabis researcher and Projects Manager for the International Hemp Association in Amsterdam and the author of "Marijuana Botany" and "Hashish!" Mark D. Merlin is Botany Professor at University of Hawai i at M?noa and author of "On the Trail of the Ancient Opium Poppy." See less