• 3 College Library
• 3 Wisconsin Historical Society Library
• 2 Social Work Library (Franks)
• 1 Special Collections (Memorial Library)
• 1 WHS State Archives Preservation Facility

• 36 Microforms

• 54 Christianity and other religions
• 54 Judaism
• 45 Relations
• 42 Religion
• 39 Catholic Church
• 37 Islam
• 34 Religious aspects
• 31 Jesus Christ
• 30 Free thought
• 28 Bible
• 25 History
• 24 Criticism, interpretation, etc
• 17 Apologetics
• 16 Atheism
• 15 Philosophy
• 12 Church history
• 12 Controversial literature
• 11 Doctrines
• 11 Rationalism
• 11 Secularism
• 7 God
• 7 Hinduism
• 7 Obedience
• 6 Catholic authors

• 14 Foote, G. W. (George William), 1850-1915
• 9 Feuerbach, Ludwig, 1804-1872
• 7 Tenney, D. K
• 7 Tyndale, William, -1536
• 6 Bradlaugh, Charles, 1833-1891
• 6 Wheeler, J. M. (Joseph Mazzini), 1850-1898
• 5 Bruno, Giordano, 1548-1600
• 4 Bays, Jack
• 4 Besant, Annie, 1847-1933
• 4 Kaplan family
• 4 Ludendorff, Mathilde Spiess, 1877-1966
• 4 Ulfat Aziz-us-Samad
• 3 Bennett, De Robigne Mortimer, 1818-1882
• 3 Deloria, Vine
• 3 Fowler, Edward, 1632-1714
• 3 Mardini, Souran
• 3 Naḥmanides, approximately 1195-approximately 1270
• 3 Ross, William Stewart, 1844-1906
• 3 Talmage, Frank
• 2 Aletheia, M. D
• 2 Aveling, Edward B., 1849-1898
• 2 Bakunin, Mikhail Aleksandrovich, 1814-1876
• 2 Barkatullāh
• 2 Celsus (Platonic philosopher), active 180
• 2 Chertkov, A. B. (Alekseĭ Borisovich)

• 285 English
• 44 German
• 36 Russian
• 21 French
• 13 Hebrew
• 11 Latin
• 10 Urdu
• 9 Italian
• 9 Spanish
• 4 Arabic
• 4 Indonesian
• 4 Japanese
• 4 Swedish
• 3 Chinese
• 3 Polish
• 3 Ukrainian
• 2 Greek, Ancient (to 1453)
• 1 Albanian
• 1 Bengali
• 1 Danish
• 1 Estonian
• 1 Greek, Modern (1453-)
• 1 Hausa
• 1 Lithuanian
• 1 Malay

• 10 Soviet Union
• 7 Germany
• 6 United States
• 5 Great Britain
• 4 India
• 4 Rome
• 3 France
• 2 Japan
• 2 Spain
• 2 Sri Lanka
• 1 Africa
• 1 Brittany
• 1 China
• 1 Europe
• 1 Iran
• 1 Malawi
• 1 Norway
• 1 Paris
• 1 Poland
• 1 Russia
• 1 Ukraine

Limit year range