Stock Photo: The Visit to the River Negro by General Julio Argentino Roca and his Army - 1892 - oil on canvas - 75x35 cm. Author: BLANES JUAN MANUEL. Location: MUSEO HISTORICO NACIONAL, BUENOS AIRES, ARGENTINA. Also known as: OCUPACION MILITAR DEL RIO NEGRO EN LA EXPEDICION AL MANDO DEL GENERAL JULIO ARGENTINO ROCA.