Die Prinzipien und Methoden der Intelligenzprüfung / von Th. Ziehen.

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Credit

Die Prinzipien und Methoden der Intelligenzprüfung / von Th. Ziehen. In copyright. Source: Wellcome Collection.

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This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.