The story of America's four million migrants, urban, agricultural, maritime, the aftermath of the last war and the depression. Causes of the migrant problem, economic, in the devastation of natural resources and the progress of technological equipment. From the decayed cotton culture of the South to the fruit plains of the East, in the story of the little farmer, of the tractors, of erosion. Today's defense program brings a new upsurge of migratory workers, absorbing some temporarily. The need for new settlement laws, for better standards in housing, health, education; for total rehabilitation of a people ever on the march. Plainspeaking document, dealing with one of America's least discussed problems. Sociological interest.