This classic book on anti-gravity and free energy is back in print.  Written by a well-known American scientist under the pseudonym of Rho Sigma,  this book delves into international efforts at gravity control and discoidcraft propulsion. Before the quantum field, there was 'ether'.  Foreword by former NASA astronaut Edgar Mitchell.

The major portion of this book contains reports of officially little-known experiments, observations, and other work carried on privately in small laboratories and by individuals throughout the world for some decades -apparently with little inter-correlation or communication as to how their work  relates to other efforts being generated simultaneously elsewhere. Progress in  borderland areas is generally painfully slow, and some conjecture is offered asto how these experiments and observations may be related in a meaningful,  useful manner to the innovative and inspirational theories brilliant  "loners."