"The subject of fall-out concerning which you write to me is complicated. The best I can do is to refer you to various authorities." BR refers her to today's New Statesman, Fallout edited by John M. Fowler and published by Basic Books, which is the most informative book, and Linus Pauling's No More War published by Dodd Mead & Co. BR also encloses a copy of Has Man a Future?. He refers also to Pirie's Fall-Out.