Matches in DBpedia 2014 for { ?s ?p <http://books.google.com/books?id=WPFYoBL6bGsC&printsec=frontcover&dq=Underground+Railroad+in+Pennsylvania&hl=en&sa=X&ei=WMstUufUE7ao4APb6IFQ&ved=0CC8Q6AEwAA#v=onepage&q=Underground%20Railroad%20in%20Pennsylvania&f=false> . }
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