by William Leonard Hughes
New York : AMS Press, 1972
図書等1972-1932
vii, 181 p. ; 22 cm
Contributions to education ; no. 541
Reprint of the 1932 ed., issued in series: Teachers College, Columbia University. Contributions to education, no. 541
Originally presented as the author's thesis, Columbia
Bibliography: p. 170-181
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