Note 124 — Fünftes Kapitel. Polwanderungen.
Reading edition
Danmark-Expeditionen til Grönlands Nordöstkyst 1906-1908, 3, Nr. 12: Nathorst, Contributions to the Carboniferous Flora of North-eastern Greenland. Köbenhavn 1911.
Reading edition
Danmark-Expeditionen til Grönlands Nordöstkyst 1906-1908, 3, Nr. 12: Nathorst, Contributions to the Carboniferous Flora of North-eastern Greenland. Köbenhavn 1911.