the rafts over as shallow water as possible so the greatest ap- proach to coral sub-stratum can be made, Recalling the = magnitude of the explosions planned, it is possible that together with the two proposed raft Shots, could increase the Strontium-90 contamination of the world by 20- or 30-fold. Most respectfully yours, I remain Sincerely, /s/ W. F, Libby