• 22 Memorial Library
• 4 Special Collections (Memorial Library)
• 2 Max Kade Institute for German-American Studies

• 6 History and criticism
• 5 Christianity
• 4 Catholic Church
• 4 Catholic authors
• 4 Controversial literature
• 4 Judaism
• 3 Apologetic works
• 3 Christianity and other religions
• 3 Church history
• 3 Relations
• 2 Catholic Church and atheism
• 2 Catholic literature
• 2 Doctrines
• 2 Irreligion
• 2 Minucius Felix, Marcus
• 2 Protestantism
• 2 Religion
• 1 Against the Galileans
• 1 Anastasius, Sinaita, Saint, active 640-700
• 1 Antisemitism
• 1 Anulus
• 1 Apolegetische Centrale (Deutsche Evangelische Kirche)
• 1 Apologeticum

• 2 Seckendorf, Veit Ludwig von, 1626-1692
• 2 Weninger, F. X. (Francis Xavier), 1805-1888
• 1 Algermissen, Konrad, 1889-1964
• 1 American Tract Society
• 1 Anastasios, I
• 1 Arduini, Maria Lodovica
• 1 Aschoff, Diethard
• 1 Augustine, of Hippo, Saint, 354-430
• 1 Axelson, Bertil, 1906-1984
• 1 Bernard, Johannes, 1926-1988
• 1 Boecklin, Johann Christoph, 1657-1709
• 1 Brüggemann, Thomas, 1966-
• 1 Burger, Franz Xaver, 1904
• 1 Chandler, Samuel, 1693-1766
• 1 Cröcker, Dorothea Rosina
• 1 Cyril, Saint, Patriarch of Alexandria, approximately 370-444
• 1 Denis, Michael, 1729-1800
• 1 Gleditsch, Johann Friedrich, 1653-1716
• 1 Haacke, Rhabanus Maurus
• 1 Heinz, Gerhard, 1936-
• 1 Heudecker, Sylvia, 1969-
• 1 Holzapfel, Wilhelm, theologian
• 1 Horst, Pieter Willem van der
• 1 Huber-Rebenich, Gerlinde
• 1 Kaufhold, Hubert

• 4 Latin
• 2 English
• 2 Italian
• 1 French
• 1 Greek, Ancient (to 1453)
• 1 Syriac

• 3 Germany
• 1 Andalusia
• 1 Europa
• 1 Europe
• 1 Russia
• 1 Spain

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