The article by Dolores Durkin of Teachers College, Columbia University, which presents the results of a longitudinal study of children who learned to read prior to school entrance? You can find it in the December 1963 issue of The Elementary School Journal.
(1964). Did You See. Reading Horizons: A Journal of Literacy and Language Arts, 4 (2). Retrieved from https://scholarworks.wmich.edu/reading_horizons/vol4/iss2/5