6. The relation of cheap food to the growth of population. (Carver, Sociology and Social Progress, pages 235-243.)
7. The effect of desert life upon health and spirits. (Carver, Sociology and Social Progress, pages 273-275.)
8. Effect of the climate of North America upon persons of European descent. (Bullock, Selected Readings in Economics, pages 1-22.)
9. The influence of the Appalachian barrier upon American colonial history. (Semple, American History and Its Geographic Conditions chapter iii.)
10. The Spanish in America. (Consult any standard history text.)
11. The French in America. (Consult any standard history text.)
12. The Dutch in America. (Consult any standard history text.)
13. The English in America. (Consult any standard history text.)
14. The qualities of an ideal people. (Carver, Elementary Economics, chapter iv.)