:An Introduction to Chaos Magic
by Peter Carroll
Two complete volumes in one. Liber Null contains a selection of extremely powerful rituals and exercises for committed occultists. Psychonaut is a manual comprising the theory and practice of magic aimed atthose seeking to perform group magic, or who work as shamanic priests to the community.
A book that was ubiquitous to many LHP practitioners before they were LHP. A book that is a bit more geared for our current age (a chapter on chemgnosis, for example. Heavily influenced by Spare with generous amounts of shamanism, paganism and various LHP tendencies.