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Leo George Hertlein ( 1898 - 1972 ) was an American paleontologist and malacologist who studied the Recent and fossil mollusks of the eastern Pacific Ocean .
 person: Leo; person: Hertlein
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: Leo, Hertlein 
Answer:
 person: Leo; person: Hertlein