The growth of ability
By: by Raymond O. Filter and Omar C. Held.
Contributors: Held, Omar Conrad, 1896- joint author.
Series: Educational psychology monographs,; no. 28
Publisher: Warwick and York, inc.
Published: 1930
Place of publication: Baltimore
Language: eng; ger
Number of pages: 174
Subjects: Ability; Educational psychology
Notes: Bibliography: p. 166-169.