1. A thousand families in Newcastle upon Tyne;Spence,1954
2. Social and biological factors in infant mortality, I: objects and methods;Morris;Lancet,1955
3. Social and biological factors in infant mortality, II: variation of mortality with mother's age and parity;Heady;Lancet,1955
4. Social and biological factors in infant mortality, III: the effect of mother's age and parity on social-class differences in infant mortality;Daly;Lancet,1955
5. Social and biological factors in infant mortality, IV: the independent effects of social class, region, the mother's age and her parity;Heady;Lancet,1955