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The Foundation to Further Consciousness
Gives information about various techniques of expanding consciousness and does research into the physiology underlying it. http://www.brainbloodvolume.com/
The International Trepanation Advocacy Group
Information on trepanation, the art of drilling holes into people's skulls. http://www.trepan.com/
An indepth source of information on medical and historical aspects of this ancient surgical procedure. Includes references and citations as well and advanced reading suggestions. http://www.trepanationguide.com/
provides scientific information, images, and articles about the practice of trepanation, including people who've done it themselves http://www.trepanation.com/