title: Trends in group medical and hospital care plans. United Mine Workers.
mesh_terms: D003032:Coal Mining; D004470:Economics, Medical; D006801:Humans; D007348:Insurance, Health; D007350:Insurance, Hospitalization; D009784:Occupational Diseases; D009786:Occupational Health Services; D010414:Pennsylvania; D010820:Physicians / Q000600:supply & distribution