VIOLLE (B.): Traité Complet des Carrés Magiques Pairs et Impairs, Paris and Dijon, 1837-38, 2 vols., 8vo, half titles, later black half-morocco (spines worn) -- Mollweide (Carolo Brandano): De Quadratis Magicis Commentatio, Leipzig, 1816, 4to, old boards. (3)