Region
Africa, Central
1
Africa, North
1
Arizona
1
British Columbia
2
Burkina Faso
1
Congo (Democratic Republic)
1
Driftless Area
1
England
2
France
2
Georgia
1
Granada
2
Great Britain
2
Mexico
1
Nantucket Island (Mass.)
1
North Carolina
1
Northwest, Pacific
1
Paris
2
Spain
2
Tanzania
1
United States
16
West (U.S.)
2
Wisconsin
1