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www.textesrares.com/philo19/livres.php4?nom_aut=Leibniz&prenom_aut=Gottfried+Wilhelm%2C+Freiherr+von&titre=Protog%E9e%2C+ou+de+la+Formation+et+des+r%E9volutions+du+globe&annee_liv=1859 (port 80)