Recommended reading on the history of medical specialization.
Holtan
Neal
N
University of Minnesota, St Paul, USA.
D006666:History of Medicine; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008093:Literature, Modern / Q000266:history*; D008513:Medicine in Literature; D008910:Minnesota; D013038:Specialization / Q000266:history*; D013044:Specialty Boards / Q000266:history*; D014481:United States