USA. Study commenting on the effects of social security legislation relating to occupational health problems of coal miners afflicted by the occupational disease of black lung pneumoconiosis - covers disability benefits, old age benefits, welfare and vocational rehabilitation, employees attitudes towards employment services, retraining, etc., and includes case studies of handicapped (disabled person) miners and a design for health services, unemployment benefit, pension schemes, etc. For middle -aged and older workers. Statistical tables.