| http://www.w3.org/ns/prov#value | - ity for Chapters 1 and 5 to 7 on fertility differentials by occupation, education, and other socio-economic variables; and Professor Whelpton is responsible for Chapter 9 on cohort fertility and Appendix B. Chapter 11 was jointly prepared.We are indebted, first of all, to the many people who have contributed to the collection and tabulation of the census data and other materials that have been uti
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