Map Gallery
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2. Oregon
3. Mount Shasta
4. Lake Tahoe
5. Los Angeles
6. Western Montana
7. Snake River Plain
8. Greater Yellowstone
9. Salt Lake
11. Grand Canyon
12. Santa Fe
13. Upper Gila
14. Big Bend
15. Llano Estacado
16. Badlands
17. Upper Missouri
18. Northern Minnesota
20. Kansas
21. Texas Hill Country
22. Superior upland
23. Driftless area
24. Illinois
25. Ozark Plateau
26. Yazoo Basin
27. Gulf Coast
29. Sea Islands
30. Great Smoky Mts
31. Ohio
32. Virginia
33. Pennsylvania
34. New York
35. New England
36. Maine