Mount Collon and the glacier of Arolla, Erin Valley, Mont Collon and Arolla Glacier in the Vallée d'Erin; Lithograph, Signed: Drawn from nature by Professor Forbes, T. Picken lith, Pl. 6, after p. 282, Forbes, James David (drawn); Picken, T. (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.
Mount Collon and the glacier of Arolla, Erin Valley, Mont Collon and Arolla Glacier in the Vallée d'Erin; Lithograph, Signed: Drawn from nature by Professor Forbes, T. Picken lith, Pl. 6, after p. 282, Forbes, James David (drawn); Picken, T. (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