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Construction Charles was built in 1907 as the commercial passenger ship SS Harvard at Chester , Pennsylvania , by the Delaware River Iron Shipbuilding and Engine Works .
 Chester , Pennsylvania, Delaware River Iron Shipbuilding and Engine Works
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Chester , Pennsylvania, Delaware River Iron Shipbuilding and Engine Works