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The performance level of children in the sixth grade in two Philadelphia public schools [microform]

Cover title · Thesis (PH. D.)--University of Pennsylvania, 1930 · Reprint from the Psychological clinic, vol. XIX, no. 8, January, 1931 · Bibliography: p. 251 · Microfilm · Master negative: 97-84151-7 · No. 7 on a reel of 30 titles · Filmed;

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