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TOWNSEND Agatha, Another Five Years in Reading.
New York
: Educational Records Bureau, 1946, p.48.
2. Sister Mary of the Visitation, Visual Perception in Reading and Spelling: A Statistical Analysis. Catholic University of American Educational Research Bulletins, Vol. IV, No. 1,
Washington
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3. Early Achievement in Reading
4. Grade trends in reading progress in kindergarten and primary grades.