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Among these may be mentioned his Recherches économiques , historiques et statistiques sur les guerres contemporaines , a series of studies published between 1863 and 1869 , in which he calculated the loss of men and capital caused by the great Europe an conflicts .
 Europe
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Europe