1. Population screening for cancer of the cervix Circular;Ministry of Health,1966
2. Screening for cancer of the cervix;Parkin;British Medical Journal,1980
3. Census 1971: England and Wales county reports: Yorkshire (W. Riding), Part 1;O.P.C.S.,1973
4. Marriage and divorce statistics;O.P.C.S.,1979
5. Census 1971: Economic activity, part IV (10% sample);O.P.C.S.,1975