Dunmore & Critcherson, 1869, The Arctic Regions: No. 36. The Glacier As Seen Flowing Or Being Forced Down Between The Hills, Ploughing Up A Moraine Of Earth And Rocks, Twenty To Thirty Feet High, Albumen print, National Gallery of Art, LL/117770
Dunmore & Critcherson, 1869, The Arctic Regions: No. 92.* The Devil's Thumb partially enveloped in a fog, with the first of the drift Ice from the pack, which was being forced towards the land, from which we escaped through a narrow lead…, Albumen print, National Gallery of Art, LL/117771