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On Problem-solving by Karl Duncker Zur Psychologie des produktiven Denkens by Karl Duncker Erscheinung und Erkenntnis des Menschlichen by Karl Duncker A German-English dictionary of psychological and psychoanalyt... by Karl Duncker EXERCISES FOR THE RAPID READING OF SCIENTIFIC GERMAN PSYCHOLO... by Karl Duncker A German-English dictionary of psychological terms, by Karl Duncker


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