 Throughout the early and mid-1930s the Circle kept a high and increasingly international profile with its numerous publications and conferences. In 1930, the Circle took over, again together with the Berlin Society, the journal Annalen der Philosophie and restarted it under the name of Erkenntnis with Carnap and Reichenbach as co-editors. (Besides publishing original articles and sustaining lengthy debates, this journal featured selected proceedings of their early conferences and documented the lecture series of the Verein Ernst Mach and the Berlin Society as well as their international congresses.) In addition, from 1928 until 1936, Schlick and Frank served as editors of their book series “Schriften zur wissenschaftlichen Weltauffassung” (“Writings on the Scientific World Conception”), which published major works by leading members and early critics like Popper, while Neurath edited, from 1933 until 1939, the series “Einheitswissenschaft” (“Unified Science”), which published more introductory essays by leading members and sympathisers. Conference-wise, the Circle organized, again with the Berlin Society, a “Second Conference for the Epistemology of the Exact Sciences” as an adjunct to the Sixth Congress of German Physicists and Mathematicians in Königsberg in September 1930 (where Reidemeister played a prominent role in the organization and Gödel first announced his incompleteness result in the discussion) and then began the series of International Congresses on the Unity of Science with a “Pre-Conference” just prior to the start of the Eighth International Congress of Philosophy in Prague in September 1934. This, their last conference in Central Europe, was followed by the International Congresses of various sizes in Paris (September 1935, July 1937), Copenhagen (June 1936), Cambridge, England (July 1938), Cambridge, Mass. (September 1939), all in the main organized by Neurath; a smaller last gathering was held in Chicago in September 1941. By 1938 their collective publication activity began to centre on a monumentally planned International Encyclopedia of Unified Science, with Neurath as editor-in-chief and Carnap and Charles Morris as co-editors; by the time of Neurath’s death in 1945, only 10 monographs had appeared and the series was wound up in 1970 numbering 20 monographs under the title “Foundations of the Unity of Science” (notably containing Thomas Kuhn’s Structure of Scientific Revolutions amongst them).