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He was born on a farm near Stone Bridge in Clarke County , Virginia , he worked as a field agent of the Slater and Jeanes Fund s and the General Education Board .
 Stone Bridge, Clarke County, Virginia, Jeanes Fund, General Education Board
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Stone Bridge, Clarke County, Virginia, Jeanes Fund, General Education Board