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Historic sites in the United States qualify to be listed on the National Register of Historic Places by passing one or more of four different criteria ; Criterion D permits the inclusion of proven and potential archaeological site s. Approximately one hundred different sites in Pennsylvania are listed under this criterion , including both Native American and European sites .
 Historic, United States, National Register of Historic Places, Pennsylvania
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Historic, United States, National Register of Historic Places, Pennsylvania