The nature of the doctor of philosophy degree: evolving conceptions.
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D004500:Education, Graduate / Q000266:history*; D004511:Education, Nursing, Graduate; D005060:Europe; D049672:History, 19th Century; D049673:History, 20th Century; D049691:History, Medieval; D006801:Humans; D009656:North America; D010684:Philosophy; D013663:Teaching