History 8,124 Catholic Church 4,556 Church history 2,581 Catholic authors 1,888 Liturgy 1,882 Religious aspects 1,860 Doctrines 1,709 Spiritual life 1,564 Christian saints 1,306 Missions 1,256 Christianity 1,193 Theology 1,055 Clergy 1,049 Controversial literature 1,014 Devotion to 992 Christian life 936 Canon law 909 Meditations 839 Christian ethics 713 Church and state 696 Biography 658 Apparitions and miracles 616 Education 580 English 553 Early works to 1800 544 Catholics 529 Lord's Supper 526 Religious life 495 Theology, Doctrinal 471 Christian education 443 Sermons 421 Bishops 412 Mass 408 Monasticism and religious orders 401 Shrines 389