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A Thesis presented to the Faculty of the Graduate College of the State University of Iowa, in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy.
This work was undertaken at the suggestion of Dean Carl E. Seashore, whose guidance in the furtherance of the research has been invaluable. I am also deeply indebted to Professor Ruckmick, Dr. Milton F. Metfessel and Dr. Lee Edward Travis, who have been generous in their suggestions and criticisms.
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