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Mel Lindquist is widely credited as being the first to seriously explore the use of spalted wood for wood turning , and his son Mark wrote groundbreaking essays in journals of the 1970s .
 person: Mel Lindquist; person: Mark
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Mel Lindquist; person: Mark