Paperback original novel. "The human mind ... the computer brain - fused together, they could form a super-mind, a potential power that might change the course of history, the face of the earth itself, and the future of mankind. Someone or something had done just - and the race was on to find out how it had been done ... and exactly what it would mean for the future."
Used availability for Walt Richmond's The Probability Corner
September 1977 : USA Mass Market Paperback