Region
- United States 22 results
- New Zealand 15 results
- Great Britain 13 results
- China 7 results
- Europe 6 results
- European Union countries 6 results
- Australia 5 results
- Asia 3 results
- Canada 3 results
- England 3 results
- Italy 3 results
- Southeast Asia 3 results
- Soviet Union 3 results
- Africa 2 results
- Developing countries 2 results
- Germany 2 results
- Japan 2 results
- Africa, North 1 results
- Case studies 1 results
- East Asia 1 results
- Eastern Front 1 results
- Egypt 1 results
- Europe, Central 1 results
- Europe, Western 1 results
- France 1 results
- Gaza Strip 1 results
- Greece 1 results
- Hong Kong 1 results
- India 1 results
- Ireland 1 results
- Islamic countries 1 results
- Israel 1 results
- Ontario 1 results
- Pacific Area 1 results
- Rome 1 results
- Scotland 1 results
- South Asia 1 results
- South Carolina 1 results
- Spain 1 results
- Sweden 1 results
- Taiwan 1 results
- Waitomo Caves (Cave) 1 results
- West Bank 1 results
- Western Australia 1 results
- Western Front 1 results