Sobre la esencia
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- Author: ZUBIRI Xavier
- Language: Spanish
- Year: 1985
- Author: Antonio Guzmán Guerra, Paloma Tejada Caller
- Language: Spanish
- Year: 2000
- Author: Paul Hazard
- Language: Spanish
- Year: 1988
- Author: Paul Hazard
- Language: Spanish
- Year: 1991
- Author: Friedrich Nietzsche
- Language: Spanish
- Year: 2005
- Author: Saint Laurent Yves, Toussaint-Samat Maguelonne, Armiño Mauro (traductor)
- Language: Spanish
- Year: 1994
- Author: Enrique Bernárdez
- Language: Spanish, Castilian
- Year: 2018
- Author: Delumeau Jean
- Language: Spanish
- Year: 1992
- Author: Ricardo Aguilera
- Language: Spanish
- Year: 1988