One January day, thirty years ago, the little town of Hanover, anchored on a windy Nebraska tableland, was trying not to be blown away. A mist of fine snowflakes was curling and eddying about the cluster of low drab buildings huddled on the gray prairie, under a gray sky. The dwelling-houses were set about haphazard on the tough prairie sod; some of them looked as if they had been moved in overnight, and others as if they were straying off by themselves, headed straight for the open plain. None of them had any appearance of permanence, and the howling wind blew under them as well as over them.