@misc{Sorge_Ernst_(1899–1946)._Autor_Mit_copyright, author={Sorge, Ernst (1899–1946). Autor and Drei Masken Verlag. Wydawca}, copyright={Public Domain}, address={Berlin}, howpublished={online}, year={copyright 1933}, publisher={Drei Masken Verlag}, language={ger}, title={Mit Flugzeug, Faltboot und Filmkamera in den Eisfjorden Grönlands : Erlebnisse mit Knut Rasmussen und Ernst Udet}, type={Text}, URL={http://www.rcin.org.pl/igipz/Content/159969/PDF/WA_172405_PTG5722-r1933_Mit-Flugzeung-Faltbo.pdf}, keywords={Greenland, glaciology, travels, geographical descriptions, geography, habits, German exploration, German discoveries}, }