Region
United States
2
Yukon
2
Aegean Islands (Greece and Turkey)
1
Alaska
1
Andes
1
Argentina
1
Asia, Eastern
1
Beaufort Sea Region
1
Colorado
1
Durango Region
1
Illinois
1
Illinois, Western
1
Mexico
1
Mississippi River Valley
1
North America
1
Pacific Coast
1
Saint Louis Metro East Area
1
San Juan Basin (N.M. and Colo.)
1
San Juan Mountains (Colo. and N.M.)
1
Southeast Asia
1
Southwestern States
1