Matches in DBpedia 2016-04 for { ?s ?p <https://books.google.com/books?id=GPR3vEzN694C&printsec=frontcover&dq=gregory+%22the+elements+of+astronomy%22&source=bl&ots=fYun1nz2j-&sig=Izv7muK4AkjlaWdOilPnOTs0LN4&hl=en&ei=9x42TcRYiZHhBqf9ibcK&sa=X&oi=book_result&ct=result&resnum=1&ved=0CBkQ6AEwAA#v=onepage&q&f=false> }
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