Canon law History 171 Ecclesiastical law 151 Interpretation and construction 60 Oriental Catholic churches 49 Government 42 Sources 42 Periodicals 35 Textbooks 31 Catholic Church 30 Christian ethics 28 Church and state 27 Law 26 Roman law 26 Dictionaries 25 Bibliography 24 Congresses 23 Church history 22 Doctrines 22 Catholic authors 21 Commentaries 21 Marriage (Canon law) 20 Theology 19 Councils and synods 18 Handbooks, manuals, etc 17 Philosophy 17 Miscellanea 16 Latin 15 Liturgy 15 Casuistry 14 Early works to 1800 10 Methodology 10 Cases 9 Clergy 9 Monasticism and religious orders 9