PRINCIPLES OF PROTECTION sets forth the definitive design standards for underground nuclear, biological, chemical, and EMP shelter engineering. The book was written by Walton McCarthy who is a mechanical engineer with 36 years’ experience in designing and installing over 1,200 underground shelters. The book was written with help from people of the US Department of Defense, US Department of Energy, Strategic Applications International, Oak Ridge National Laboratories, Nuclear Engineering Laboratory from the University of Illinois, Brookhaven National Laboratory, Chemical Division of Edgewood Arsenal, US National Bureau of Standards, and the US Defense Nuclear Agency. This is the book that the US Government should have written with tables showing actual radiation doses based on the distance from ground zero and the size of the nuclear weapon. It is used by engineers and architects around the world.