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Peter Dmitrievich Grushin ( , January 15 , 1906 , Volsk , Russian Empire — November 29 , 1993 ) was the Soviet rocket scientist , academician of the AS USSR ( since 1966 ) .
 Grushin, Volsk, Russian Empire, AS USSR
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Grushin, Volsk, Russian Empire, AS USSR