Medicine in stamps. Ivan Petrovich Pavlov (1849-1936): conditioned reflexes.
Tan
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Medicine, John A Burns School of Medicine, University of Hawaii, USA.
Graham
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D000818:Animals; D003214:Conditioning, Classical; D004285:Dogs; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008512:Medicine in the Arts; D009613:Nobel Prize; D010678:Philately