GOS (François). Du Rhône au Rhin, par les cols de la Furka et Oberalp. Geneva, Sonor, 1914. Colour lithographed poster, canvas-backed. Very fine poster depicting the Rhône glacier. Condition A. François Gos (Geneva 1880 - 1975), son of Albert Gos and elder brother of Charles Gos, was a Swiss painter, draughtsman, sculptor, poster artist and writer. Co-founder of the Lausanne School of Art, he was an artist with a long and prolific career, at the service of nature, which he observed for many years.