Catholic Church 478 Religious aspects 203 Liturgy 115 Church and social problems 72 Lord's Supper 54 Relations 54 Doctrines 51 Clergy 50 Moral and ethical aspects 42 Christianity 39 Religious life 38 Mass 37 Education 32 Peace 32 Catechetics 30 Texts 29 Celebration 27 Evangelistic work 27 Christian education 26 Missions 26 Christian sociology 25 Holy Year, 2000 22 Catholic authors 19 Abortion 18 Study and teaching 18 Christianity and politics 17 Bishops 16 Deacons 16 Emigration and immigration 16 Marriage 16 Families 15 Papal documents 15 Priesthood 15 Church 14 Catholic schools 13