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The final goal pursued by the Vienna Circle was unified science, that is the construction of a "constitutive system" in which every legitimate statement is reduced to the concepts of lower level which refer directly to the given experience. "The endeavour is to link and harmonise the achievements of individual investigators in their various fields of science". From this aim follows the search for clarity, neatness, and for a symbolic language that eliminates the problems arising from the ambiguity of natural language. The Vienna Circle published a collection, called "Einheitswissenschaft" ("Unified Science"), edited by Rudolf Carnap, Philipp Frank, Hans Hahn, Otto Neurath, Jørgen Jørgensen (after Hahn's death) and Charles W. Morris (from 1938), whose aim was to present a unified vision of science. After the publication in Europe of seven monographs from 1933 to 1939, the collection was dismissed, because of the problems arising from the World War II. In 1938 a new series of publications started in the United States. It was the "International Encyclopedia of Unified Science", an ambitious project never completed devoted to unified science. Only the first section "Foundations of the Unity of Sciences" was published; it contains two volumes for a total of twenty monographs published from 1938 to 1969. As remembered by Rudolf Carnap and Charles Morris in the "Preface" to the 1969 edition of the International Encyclopedia of Unified Science: