Eye sketch of the Glacier of Chermontane and Col de Fen阾res - Eye sketch of the Pass of the Mont Collon - Eye sketch and magnetic bearings from the Col d'Erin between Evollena and Zermatt; Topographical representations; Chermontane Glacier; Mont Collon; Col d'Erin; to p. 268; Schenck; Fr. (lith.); 1843; James David Forbes: Travels through the alps of Savoy and other parts of the Pennine Chain with observations of the phenomena of glacier. Edinburgh: Adam and Charles Black; 1843