Bütler, Heinrich. “Geological Map of East Greenland. Parts of Ole Römers Land, Hudson Land, Gauss Peninsula and Ymers Island”. Meddelelser om Grønland 143, no. 1 (May 20, 1950): Plate 7. Accessed February 13, 2026. https://tidsskrift.dk/meddrgroenland/article/view/165863.