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Among his most influential books are " The Principles of Psychology " , a groundbreaking text in the field of psychology ; " Essays in Radical Empiricism " , an important text in philosophy ; and " The Varieties of Religious Experience " , an investigation of different forms of religious experience , including theories on mind-cure .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None