Russell, James2014-03-112011Russell, James R. 2011. "A Tale of Two Secret Books." Paper presented at Knowledge to die for: Transmission of prohibited and esoteric knowledge through space and time, May 2-4, 2011, Berlin, Germany.http://nrs.harvard.edu/urn-3:HUL.InstRepos:11879455en-USConference Paper2014-03-11