The popularization of entheogens by the Wassons, Leary, Terence McKenna, Robert Anton Wilson and many others led to an explosion in the use of psilocybin mushrooms throughout the world. By the early 1970s, many psilocybin mushroom species were described from temperate North America, Europe, and Asia and were widely collected. Books describing methods of cultivating large quantities of "Psilocybe cubensis" were also published. The availability of psilocybin mushrooms from wild and cultivated sources have made them one of the most widely used of the psychedelic drugs.