1. The Registrar General's social classes;Trends, R.; Fox;Population Trends,1975
2. Appendix: Proposals for a minimum basic data set in England;Mason, A.,1982
3. pIarrwtiisculLaMr.refSeurrevnecielltaonccheildingrodwetvhe.lIonpteJdEpcioduentmriioels with,1976
4. Scotland. J Epidemiol Community Health 1978; 32: 147-54.