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- catalog contributor b8758599.
- catalog contributor b8758600.
- catalog date "1962".
- catalog description "Bibliography: p. 341-342.".
- catalog isPartOf "Genetic psychology monographs ; v. 66".
- catalog isPartOf "Genetic psychology monographs.".
- catalog issued "1962".
- catalog language "eng".
- catalog relation "Genetic psychology monographs.".
- catalog subject "Learning, Psychology of.".
- catalog subject "Vacations.".
- catalog title "Achievement gains or losses during the academic year and over the summer vacation period: a study of trends in achievement by sex and grade level among students of average intelligence [by] Kenneth M. Parsley, Jr. and Marvin Powell.".
- catalog type "text".