Title: Fertility and occupation
Subjects: Economic aspects, Economic aspects of Population, Human Fertility, Occupations, Population, Bevolking, Professions, Fecondite humaine, Bevolkerungswachstum, Aspect economique, Industrialisierung, Mijnbouw, Bevolkerungsentwicklung, Industrie, Fertility, Vruchtbaarheid, Fertility, human, Birth Rate, Fertilization, Population Growth, Social Conditions