1. Shaw H. J. (1954) Personal communication.
2. Ministry of Education (1955) Personal communication.
3. Ministry of Labour and National Service (1954) Personal communication.
4. Ministry of Education (1956a) “The Health of the School Child”, Report of the Chief Medical Officer of the Ministry of Education, 1954 and 1955, p. 39, London.
5. Registrar General (1952) Census of great Britain 1951. 1 per cent. Sample Tables Part I, p. 83. London.