References
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- Dunn L. M. Peabody Picture Vocabulary Tat. American Guidance Service, Circle Pines, MN 1959
- Central Statiscal Office. social Trends, D. Ram rakash. HMSO, London 1983
- Office Of Population Censuses And Surveys. Education Evaluation Enterprises Awre. Glos. NFER-Nelson, Berks 1981, census 1981: Preliminary Report: England and Evaluation Enterprises
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