[Discurso en la] Solemne sesión celebrada el día 30 de mayo de 1934 en la Real Academia de Ciencias Exactas, Físicas y Naturales, bajo la presidencia del Excmo. Sr. Presidente de la República para hacer entrega de la Medalla Echegaray al Excmo. Señor D. Joaquín María de Castellarnau. Con un discurso de contestación de éte último

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