Logic in 1967

Logic and the Nature of Reality by Kattsoff, Louis O.

Formale Logik by Lorenzen, Paul

Räumliche Vorstellung Und Mathematisches Erkenntnisvermögen: Zweiter Band by Verloren Van Themaat, P.

An Introduction to Symbolic Logic by Langer, Susanne K.

Studies on Gottlob Frege and Traditional Philosophy by Angelelli, I.

Ludwig Wittgenstein: His Place in the Development of Semantics by De Mauro, T.

The Logic of Decision and Action by Rescher, Nicholas

Past, Present and Future by Prior, Arthur N.