WITTGENSTEIN, Ludwig Prototractatus / by Ludwig Wittgenstein: edited by B.F. Mcguinness, T. Nyberg, G.H. von Wright: translated by D.F.Pears B.F. McGuinness - London Routledge & Kegan Paul 1971 - 256 p. ISBN: 710067887 Dewey Class. No.: 193 / WIT