GARCIA NAJERA, José María - Aplicación del frenado hidráulico en las escalas salmoneras. Estudio hidrodinámico de dos tipos: continuado de rampa y vertical intermitente

Madrid: Ministerio de Agricultura, 1949.- 54 p., [2 h.]: Ilustraciones entre el texto; 4º (24,2 x 17,3 cm); Cartulina Ed..- (Ministerio de Agricultura. Instituto Forestal de Investigaciones y Experiencias. Año XX., 1949, Nº 47).* La esquina superior externa con una mancha de humedad que no afecta a la textura del papel. ICTIOLOGÍA E HIDROBIOLOGÍA EN GENERAL Libro en español

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