@misc{Wallengren_Hans_(1864–1938)._Redaktor_Die_1928,
 author={Wallengren, Hans (1864–1938). Redaktor},
 copyright={Public Domain},
 address={Berlin},
 address={Kopenhagen},
 address={Malmö},
 address={Amsterdam},
 journal={Gefion Verlags Populärwissenschaftliche Serie},
 howpublished={online},
 year={1928},
 publisher={Gefion-Verlag},
 language={ger},
 title={Die grossen Entdeckungsreisen},
 type={Text},
 URL={http://www.rcin.org.pl/igipz/Content/112062/PDF/WA51_114000_PTG12114-r1928_Die-grossen.pdf},
 keywords={geographical discoveries, history, chronology, biographies, discoverers},
}