site.btaObservances: March 18

Radio-Engineering Troops Day (since 1993).

On this date in Bulgarian history:

1991: National Statistical Institute is set up by Statistics Act, passed by Seventh Grand National Assembly, to replace Central Statistical Department.

1992: Bulgaria signs UNECE Convention on the Protection and Use of Transboundary Watercourses and International Lakes in Helsinki.

2004: 39th National Assembly ratifies the North Atlantic Treaty, signed in Washington on April 4, 1949, in force for Bulgaria from March 29, 2004.