W1973 Soviet nuclear tests
WAeroflot Flight 19
WAeroflot Flight 109
WAeroflot Flight 141
WAeroflot Flight 630
WAeroflot Flight 964
WAeroflot Flight 2022
WAeroflot Flight 3932
WAeroflot Flight 6551
WAeroflot Flight A-13
WBalkan Bulgarian Airlines Flight 307
W1973 Soviet economic reform
WKosmos 557
WThe Land of Sannikov
WLuna 21
WLunokhod 2
WMars 4
WMars 6
WMars 7
WSalyut 2
WSoyuz 12
WSoyuz 13
W1973 World Congress of Peace Forces