The effect of time upon variability
By: by Ella Woodyard.
Publisher: Teachers college, Columbia university
Published: 1926
Place of publication: New York city
Language: eng
Number of pages: 56
Subjects: Mental tests
Notes: Bibliography: p. 56.
Thesis (PH. D.)--Columbia university, 1926.
Vita.
Published also as Teachers college, Columbia university, Contributions to education, no. 216.