5th International Swan Symposium 2014
Easton, Maryland, USA
4th International Swan Symposium 2002
Warrenton, Virginia, USA
3rd International Swan Symposium 1989
Oxford, Oxfordshire, UK
2nd International Swan Symposium 1980
Sapporo, Hokkaido, Japan
1st International Swan Symposium 1973
Slimbridge, Gloucestershire, UK
