Austria

1973 Landscapes of Austria

1973 The 100th Anniversary of Vienna’s First Fresh Water Aqueduct

1973 Europhot Convention, Vienna

1973 The 50th Anniversary of Interpol

1973 The 50th Anniversary of the Death of Ferdinand Hanusch

1973 The 100th Anniversary of the Vienna Trotting Association

1973 The 100th Anniversary of the Birth of Max Reinhardt

1973 The 13th IULCS Convention in Vienna

1973 The 100th Anniversary of the World Meteorological Organization

1973 The 100th Anniversary of the Discovery of Franz Josef Land