Region
European Economic Community countries
13
Europe
9
Great Britain
5
Netherlands
5
United States
5
European Union countries
3
Europe, Eastern
2
Germany
2
Australia
1
Belgium
1
CentralEurope
1
China
1
England
1
Georgia
1
Germany, West
1
Leiden (Netherlands)
1
Leyden
1
Near East
1
North America
1
Oxford (Oxfordshire)
1
Sweden
1
d European Economic Community countries
1