En portada: Volume I of the proceedings of the second International Congress of Neuro-Genetics and Neuro-Ophthalmology of the World Federation of Neurology. Montreal 17-22 september 1967
En portada: Volume II of the proceedings of the second International Congress of Neuro-Genetics and Neuro-Ophthalmology of the World Federation of Neurology. Montreal 17-22 september 1967