• 7 Nietzsche, Friedrich Wilhelm, 1844-1900
• 7 Philosophers
• 2 Authors, American
• 2 Authors, Spanish
• 2 Criticism and interpretation
• 2 Jiménez, Juan Ramón, 1881-1958
• 1 Alba quieta
• 1 Altolaguirre, Manuel, 1904-1959
• 1 Andrés Cobos, Pablo de, 1899-1973
• 1 Arendt, Hannah, 1906-1975
• 1 Austen, Jane, 1775-1817
• 1 Authors, German
• 1 Authors, Irish
• 1 Bishops
• 1 Braulio, Saint, Bishop of Zaragoza, approximately 585-approximately 651
• 1 Bukowski, Charles
• 1 Catholic Church
• 1 Christian saints
• 1 Church history
• 1 Clemens, Olivia Langdon, 1845-1904
• 1 Communists
• 1 Composers
• 1 Composers' spouses
• 1 Darwin, Charles, 1809-1882

• 7 Santiago Guervos, Luis Enrique de
• 6 Nietzsche, Friedrich Wilhelm, 1844-1900
• 2 Parmeggiani, Marco
• 1 Aeschines
• 1 Altolaguirre, Manuel, 1904-1959
• 1 Andrés Cobos, Pablo de, 1899-1973
• 1 Andrés, María Soledad de
• 1 Arendt, Hannah, 1906-1975
• 1 Austen, Jane, 1775-1817
• 1 Balseiro, María Luisa
• 1 Braulio, Saint, Bishop of Zaragoza, approximately 585-approximately 651
• 1 Browne, E. J. (E. Janet), 1950-
• 1 Bukowski, Charles
• 1 Burkhardt, Frederick, 1912-2007
• 1 Castañón, Adolfo, 1952-
• 1 Clemens, Olivia Langdon, 1845-1904
• 1 Darwin, Charles, 1809-1882
• 1 Demosthenes
• 1 Fernández Simón, Alma
• 1 García Ruiz, José Miguel
• 1 García, Carlos, 1953-
• 1 Gauguin, Paul, 1848-1903
• 1 Gutiérrez Álvarez, José, 1946-
• 1 Heredia, David, 1972-

• 24 Spanish
• 1 Greek, Ancient (to 1453)

• 8 Germany
• 3 England
• 1 Chawton
• 1 France
• 1 Greece
• 1 Mexico
• 1 Reading
• 1 Spain
• 1 Zaragoza

• 1 Bibliography
• 1 Biography
• 1 Diaries
• 1 Love letters
• 1 Personal correspondence
• 1 Translations into Spanish

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