ch. 1. Newfoundland and Labrador -- ch. 2. Quebec -- ch. 3. The Maritimes -- ch. 4. New England -- ch. 5. New York and Ontario -- ch. 6. The Middle Atlantic -- ch. 7. The Southern Appalachians -- ch. 8. The interior low plateaus -- ch. 9. The Ozarks and the Ouachitas -- ch. 10. The Southeastern Piedmont and the coastal plain -- ch. 11. The Florida peninsula -- ch. 12. The Gulf coastal plain and the alluvial -- ch. 13. The corn belt -- ch. 14. The lower Great Lakes -- ch. 15. Texas and the southern plains -- ch. 16. The prairie wheat lands -- ch. 17. The southern Rocky Mountains and the high plains -- ch. 18. The Missouri plateau -- ch. 19. The northern Rocky Mountains and the Columbia-Snake Plateau -- ch. 20. The Great Basin -- ch. 21. The Colorado Plateau and the desert southwest -- ch. 22. The upper Great Lakes -- ch. 23. The Canadian shield -- ch. 24. The far north -- ch. 25. The Pacific Northwest -- ch. 26. California -- ch. 27. Hawaii.