Matches in DBpedia 2016-04 for { ?s ?p <https://books.google.com/books?id=8vstAAAAIAAJ&pg=PA328&lpg=PA328&dq=%22the+two++principal+laws+of+sociology%22&source=bl&ots=h0hg1Uacww&sig=_YMXyGOFTe5354mLmgQ3sNMF2nc&hl=en&sa=X&ei=boD3VPPBIIzmsATj4oL4DA&ved=0CC0Q6AEwBQ#v=onepage&q=%22the%20two%20%20principal%20laws%20of%20sociology%22&f=false> }
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