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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. Strachan, T., and A.P. Read 1999 Human Molecular Genetics, 2nd ed. Oxford: BIOS Scientific. Swan, S.H., E.P. Elkin, and L. Fenster 1997 Have sperm densities declined? A reanalysis of global trend data. Environmental Health Perspectives 105:1228-1232. Taylor, A. 2002 The Influence of Non-response on Estimates of Genetic and Environmental Effects in Behavioral-Genetic Models of Twins. Manuscript submitted for publication. Thompson, L.A., D.K. Detterman, and R. Plomin 1991 Associations between cognitive abilities and scholastic achievement: Genetic overlap but environmental differences. Psychological Science 2:158-165. Thorpe, K., M. Rutter, and R. Greenwood In press Twins as a natural experiment to study the causes of mild language delay: 2. Family interaction risk factors. Journal of Child Psychology and Psychiatry. Tizard, J. 1975 Race and IQ: The limits of probability. New Behaviour 1:6-9. Trumbetta, S.L., and I.I. Gottesman 2000 Endophenotypes for marital status in the NAS-NRC twin registry. Pp. 253-269 in Genetic Influences on Human Fertility and Sexuality: Theoretical and Empirical Contributions from the Biological and Behavioral Sciences. J.L. Rodgers, D.C. Rowe, and W.B. Miller, eds. Boston: Kluwer. van Wieringen, J.C. 1986 Secular growth changes. Pp. 307-331 in Human Growth, Vol. 3, Methodology, 2nd ed. F. Falkner and J.M. Tanner, eds. New York: Plenum Press. Walker, S.O., S.A. Petrill, F.M. Spinath, and R. Plomin 2002 Nature, Nurture and Academic Achievement: A Twin Study of Teacher Ratings of 7 Year Olds. Manuscript submitted for publication. Weir, J.B. de V. 1952 The assessment of the growth of schoolchildren with special reference to secular changes. British Journal of Nutrition 6:19-33.
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