Oracles and Demons of Tibet (paperback) by Rene de Nebesky-Wojkowitz
Rene de Nebesky-Wojkowitz, a scholar and adventurer who studied Tibetan culture (primarily in Sikkim), journeyed to the Himalayan region in the 1950s just before and during the Chinese invasion of Lhasa, when great upheavals were taking place in Tibetan society and culture. This book, a reprint of a long out-of-print study, sheds fascinating insights on the occult secrets of Tibetan mysticism. It details the classification, appearance, and attributes of the Tibetan protective deities, their iconography, sacrifices, ceremonies, oracles, ritual dances, black magic and their cult of weather making.