File:Sierra de Gredos, Contribución al estudio del Sistema Central, José F. Zabala, portada.jpg

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Public domainPublic domainfalsefalse

This work was published before January 1, 1929 and it is anonymous or pseudonymous due to unknown authorship. It is in the public domain in the United States as well as countries and areas where the copyright terms of anonymous or pseudonymous works are 95 years or fewer since publication.

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