75/2226 Erkenntnis. 1930-1940. Ed. R. Carnap und H. Reichenbach. Leipsic, F. Meiner (vol.I - VI)/ The Hague, Van Stockum & Zoon (vol. VII and VIII), 1930-1940, 8 vols., contemp. unif. hcalf w. mor. letterpiece.

- Covers sl. discol.; spines trifle rubbed (incl. letterpieces). Otherwise fine.

= Only the 8th vol. titled as ''The Journal of Unified Science (erkenntnis)'', with English text instead of German.