From a young age, he contributed to local, national, and international periodicals such as Ilustración Valenciana [Valencian Illustration], La Época [The Era], El Liberal [The Liberal], La Vanguardia [The Vanguard], La Ilustración Ibérica [The Iberian Illustration], El Heraldo de Madrid [The Herald of Madrid], El Sol [The Sun], and La Nación de Buenos Aires [The Nation of Buenos Aires] . At the age of 15, Altamira published his first texts in La Antorcha [The Torch] of Alicante in 1881, including Gazul el guerrillero [Gazul the Guerrilla]. That same year, he also wrote pieces such as La marcha de la civilización [The March of Civilisation] and La exposición internacional de electricidad [The International Exhibition of Electricity], alongside a few poems like En el campo [In the Countryside] and A la señora C.E. [To Mrs C.E.] However, it was not until he completed his doctoral studies that Altamira produced his first major scientific work, his doctoral thesis titled Historia de la Propiedad comunal [History of Communal Property], published in Madrid in 1890. Among the international journals in which he contributed were Revue Historique [Historical Review] (1890), The Athenaeum, Bulletin Hispanique, and Anuario de Ciencias Históricas de Berlín [Yearbook of Historical Sciences of Berlin]. He also wrote for legal journals such as Revista de Derecho Internacional [Journal of International Law], Legislación y Jurisprudencia [Legislation and Jurisprudence] , Revista Jurídica de Cataluña [Legal Journal of Catalonia], and La Administración [The Administration] ( Diccionario Akal …, 2002, p. 74). During his years of exile in America, he collaborated with publications including Revista de Historia de América [Journal of American History], Revista de la Facultad de Filosofía y Letras [Journal of the Faculty of Philosophy and Philology], Boletín de la Academia de Historia y Geografía [Bulletin of the Academy of History and Geography], Revista de la Escuela Nacional de Jurisprudencia [Journal of the National School of Jurisprudence] , Criminalia, Cuadernos Americanos [American Journals] , Revista Cubana [Cuban Journal], among others.

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