A special study of the incidence of retardation, by Louis B. Blan. New York, Teachers College, Columbia University, 1911.
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Slow learning children -- Case studies.
Contributions to education, no. 40.
111 p. illus. 22 cm.
Originally presented as the author's thesis, Columbia.
Reprint of the 1911 ed., issued in series: Teachers College, Columbia University. Contributions to education, no. 40.
Bibliography: p. 109-111.
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