Region
- United States 18 Treffer
- China 8 Treffer
- Australia 4 Treffer
- Allegany County 2 Treffer
- Appalachian Region 2 Treffer
- Arctic regions 2 Treffer
- California 2 Treffer
- East Liverpool 2 Treffer
- Great Lakes (North America) 2 Treffer
- Ireland 2 Treffer
- Islamic countries 2 Treffer
- Israel 2 Treffer
- Monterey Bay 2 Treffer
- Monterey Bay (Calif.) 2 Treffer
- New York (State) 2 Treffer
- Ohio 2 Treffer
- Poland 2 Treffer
- Tropics 2 Treffer
- Wisconsin 2 Treffer