of Portugal Treaties of the Socialist Republic of Romania Treaties of the Soviet Union Treaties of San Marino Treaties of Senegal Treaties of Serbia and Montenegro Treaties of Yugoslavia Treaties of Seychelles Treaties of Slovakia Treaties of Slovenia Treaties of Sweden Treaties of Switzerland Treaties of Tajikistan Treaties of North Macedonia Treaties of Tunisia Treaties of Turkmenistan Treaties of the Ukrainian Soviet Socialist Republic Treaties of the United Kingdom Treaties of the United Arab Emirates Treaties of Uzbekistan Treaties of Vietnam 1968 in Austria Transport treaties 1968 in transport Treaties extended to West Berlin November 1968 events 1960s in Vienna Transportation engineering standards