Penetration:The Question of Extraterrestrial and Human Telepathy
Ingo Swann
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As it turned out, among those taking an active interest in the possibility of interplanetary spying was a group so clandestine that it could be characterized not merely as a deepest black project, but as an entirely invisible one.
It was this group, or whatever it might be called, that I met up with in the early part of 1975.