Region
- Great Britain 4 results
- United States 3 results
- Bulgaria 2 results
- France 2 results
- Africa, North 1 results
- Colombia 1 results
- Developing countries 1 results
- English-speaking countries 1 results
- Greece 1 results
- Ireland 1 results
- Keweenaw Peninsula (Mich.) 1 results
- Michigan 1 results
- Poland 1 results
- Rome 1 results
- Russia 1 results
- Russia (Federation) 1 results
- Soviet Union 1 results
- Wales 1 results