Logical papers: by G.H.R. Parkinson a selection translated and edited with an introduction/ Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716. Parkinson, G. H. R. (George Henry Radcliffe), ed. & tr. Logic. Logic, Symbolic and mathematical. B2558 .P3 160.9 LEL Bibliography: p. [vii]-viii. Oxford: Clarendon P., 1966. 1966. 1966 Text lxv, 148 p.: eng eng ger