• 8 Nietzsche, Friedrich Wilhelm, 1844-1900
• 7 Philosophers
• 5 Criticism and interpretation
• 4 History
• 2 Authors, American
• 2 Authors, German
• 2 Authors, Spanish
• 2 Calvino, Italo
• 2 Christian saints
• 2 Christianity
• 2 Henríquez Ureña, Pedro, 1884-1946
• 2 Jiménez, Juan Ramón, 1881-1958
• 2 Luxemburg, Rosa, 1871-1919
• 2 Monnier, Pierre, 1891-1915
• 2 Philosophy
• 2 Reyes, Alfonso, 1889-1959
• 2 Rilke, Rainer Maria, 1875-1926
• 2 Spiritual life
• 1 Alatorre, Antonio
• 1 Alba quieta
• 1 Altolaguirre, Manuel, 1904-1959
• 1 Andrés Cobos, Pablo de, 1899-1973
• 1 Arendt, Hannah, 1906-1975
• 1 Attitudes

• 7 Nietzsche, Friedrich Wilhelm, 1844-1900
• 7 Santiago Guervos, Luis Enrique de
• 3 Castañón, Adolfo, 1952-
• 2 Calvino, Italo
• 2 Camarero Gil, Alfredo
• 2 Contreras, Isaura, 1982-
• 2 Izquierdo, Maritza
• 2 Luxemburg, Rosa, 1871-1919
• 2 Monnier, Pierre, 1891-1915
• 2 Parmeggiani, Marco
• 2 Prieur, Jean
• 2 Pujante Corbalán, Rubén
• 2 Reyes, Alfonso, 1889-1959
• 2 Rilke, Rainer Maria, 1875-1926
• 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 Berlanga, Tomás de, approximately 1485-1551
• 1 Bernárdez, Aurora
• 1 Braulio, Saint, Bishop of Zaragoza, approximately 585-approximately 651
• 1 Browne, E. J. (E. Janet), 1950-

• 45 Spanish
• 1 Latin

• 9 Germany
• 3 England
• 1 Antioch
• 1 Chawton
• 1 Chile
• 1 France
• 1 Galapagos Islands
• 1 Italy
• 1 Mexico
• 1 Reading
• 1 South America
• 1 Spain
• 1 Turkey
• 1 Zaragoza

• 23 Correspondence
• 2 Letters
• 1 Bibliography
• 1 Biography
• 1 Congresses
• 1 Diaries
• 1 Early works to 1800
• 1 Interviews
• 1 Love letters
• 1 Personal correspondence

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