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WikiPedia: Opticks http://books.google.com/books?id=GnAFAAAAQAAJ http://gallica.bnf.fr/ark:/12148/bpt6k3362k http://www.rarebookroom.org/Control/nwtopt/index.h... http://cudl.lib.cam.ac.uk/view/MS-ADD-03970/ https://archive.org/details/Optics_285