338540
That year he returned to what had become the state of Oregon and served as the principal at the Bethel Institute in the Eola Hills in Polk County .
 Oregon, Bethel Institute, Polk County
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Oregon, Bethel Institute, Polk County