Various 
Routledge Library Editions: Occultism [PDF ebook] 

The volumes in this set, originally published between 1978 and 1992, draw together research by leading academics in the area of the occult and provide a rigorous examination of related key issues. The collection examines occultism from a broad range of disciplines, from shamanism and the occult tarot, to the esoteric and spiritualism. It includes volumes across the disciplines of religion, covering new religious movements, spiritualism, ritual and magic practices. The three books that comprise this set include investigations into the evolution of occultism, as well as the history and practices of the occult as a religious movement. This collection brings back into print insightful and detailed books and will be a must-have resource for academics and students, not only of religion and anthropology, but also of history and psychology.