The fate of Blue Shield and the new blues.
D054598:Blue Cross Blue Shield Insurance Plans / Q000266:history / Q000458:organization & administration; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D007348:Insurance, Health / Q000191:economics / Q000266:history / Q000331:legislation & jurisprudence; D013023:South Dakota