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Works His first book appeared in London in 1630 : ' Exercitationes et Animadversiones in Librum Gulielmi Harvaei de Motu Cordis et Circulatione Sanguinis , ' and is an attempt to refute Harvey 's demonstration of the circulation of the blood .
 Harvey
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Harvey