Prepayment medical clinics of the Mesabi Iron Range: 1904-1964.
D049673:History, 20th Century; D006801:Humans; D007350:Insurance, Hospitalization / Q000266:history*; D008906:Mining; D008910:Minnesota; D009787:Occupational Medicine / Q000266:history*; D010044:Outpatient Clinics, Hospital / Q000266:history