All of these except Trent and Vatican II were downloaded from: http://abbey.apana.org.au/councils/~index.htm

Trent was downloaded from Hanover Historical Texts Project

Vatican II was downloaded from the Vatican Archives
[Council of Nicaea (325)] [First Council of Constantinople (381)] [Council of Ephesus (431)] [Council of Chalcedon (451)] [Second Council of Constantinople (553)] [Third Council of Constantinople (680-681)] [Second Council of Nicaea (787)] [Fourth Council of Constantinople (869)] [First Lateran Council (1123)] [Second Lateran Council (1139)] [Third Lateran Council (1179)] [Fourth Lateran Council (1215)] [First Council of Lyons (1245)] [Council of Lyons (1274)] [Council of Vienne in France (1311-1313)] [Council of Constance (1414-1418)] [Council of Basle (1431)] [Fifth Lateran Council(1512-1517)] [Council of Trent (1545-1563)] [First Vatican Council(1869-1870)] [Vatican II (1962-1968)] [Abbreviations used ]
I NICAEA EPHESUS I CONSTANTINOPLE CHALCEDON HISTORICAL DISCOVERY II CONSTANTINOPLE III CONSTANTINOPLE II NICAEA IV CONSTANTINOPLE I LATERAN I LYONS II LYONS VIENNE CONSTANCE BASLE V LATERAN TRENT I VATICAN VATICAN II II LATERAN III LATERAN IV LATERAN