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Giants in the Earth ( Norwegian : Verdens Grøde ) is a novel by Norwegian-American author Ole Edvart Rølvaag .
 Ole Edvart Rølvaag
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ole Edvart Rølvaag