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* The author wishes to acknowledge the assistance of Dr. William L. Jenkins, Professor of Education, Lehigh University; Dr. Donald D. Durrell, Professor of Education, Boston University, and Dr. Herbert S. Conrad, Director, Research and Statistical Services Branch, Department of Health, Education, and Welfare, Office of Education, Washington, D.C., who were kind enough to read the manuscript in its entirety and to offer many valuable suggestions for its development.
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