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Author(s): Chambers, R. L. Title: *Changes in achievement following the removal of certain physical of defects in elementary school pupils [University of Pennsylvania] Subject(s): Child abnormal: Medical aspects Pagination: 131 p. Place of Publication: Phila. Date of Publication: 1931 Size: 8°. Language: English Type of Resource: Dissertation Series/Volume/Page: Series 4/Volume 3/Page 521