The effect of time upon variability. New York, Bureau of Publications, Teachers College, Columbia University, 1926.
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Contributions to education, no. 216.
v, 56 p. 22 cm.
Originally presented as author's thesis, Columbia.
Reprint of the 1926 ed., issued in series: Teachers College, Columbia University. Contributions to education, no. 216.
Bibliography: p. 56.
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