Austria

1973 The 39th Convention of the International Institute of Statistics

1973 The 100th Anniversary of the Birth of Leo Slezak

1973 Sports – Steeplechaser Military Pentathlon

1973 The 25th Anniversary of the Dornbirn Fair

1973 EUROPA Stamps

1973 The 25th Anniversary of the Primary Association of the Austrian Social Security Carrier

1973 The 100th Anniversary of the Birth of Otto Loewi

1973 Aviation Anniversary 1973

1973 The 100th Anniversary of the Birth of Dr. H.C. Theodor Körner

1973 Drug Abuse