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www.textesrares.com/philo19/livres.php4?nom_aut=Boucheporn&prenom_aut=%5BRen%E9+Charles%5D+F%E9lix+%5BBertrand%5D%2C+baron+de&titre=Du+Principe+g%E9n%E9ral+de+la+philosophie+naturelle&annee_liv=1853 (port 80)