42Tagebuch 28. XII. 1937 – 20. XII. 1938 [Rudolf Carnap: Tagebücher], Eintrag Mi 31. VIII. 1938

Gelegen. – Enzykl.IFoundations of the Unity of ScienceB1939@„Foundations of Logic and Mathematics“, Foundations of the Unity of Science 1 (3), 1939

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