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WikiPedia: Claude Adrien Helvétius http://dictionary.reference.com/browse/c+helvetius //archive.org/search.php?query=((subject:%22Helv%C... https://books.google.com/books?id=5UAAAAAAQAAJ https://books.google.com/books?id=FZk5AAAAcAAJ&pg=... https://books.google.com/books?id=HQ9S-xWkIBcC&dq= https://books.google.com/books?id=hKxBs-aR2hEC