A study of the nature of difficulty
By: by Jacob S. Orleans.
Series: Teachers College, Columbia University. Contributions to education, no. 206; Contributions to education -- no. 206.
Publisher: Teachers college, Columbia university
Published: 1926
Place of publication: New York city
Language: eng
Number of pages: 39
Subjects: Educational tests and measurements.; Educational psychology.
Other titles: Difficulty, A study of the nature of.
Notes: Published also as thesis (Ph.D.) Columbia university, 1926.

Bibliography: p. 38-39.