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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 .
 Leo, Hertlein
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Leo, Hertlein