The Projection of the Astral BodySylvan J. Muldoon and Hereward Carrington; introduction by Carrington
Cosmic Consciousness: A Study in the Evolution of the Human MindWritten and edited by Richard Maurice Bucke
From India to the Planet Mars: A Study of a Case of Somnambulism with GlossolaliaThéodore Flournoy; translated by Daniel B. Vermilye
Knowledge of the Higher Worlds and Its AttainmentRudolf Steiner; translated by G. Metaxa; edited by Harry Collison