@misc{Theuer_Oscar._Il._Die_cop.,
 author={Theuer, Oscar. Il. and Cremer, Wilhelm (1874–1932). Oprac.},
 copyright={Public Domain},
 address={Berlin},
 howpublished={online},
 year={cop. 1924},
 publisher={Rudolf Mosse},
 language={ger},
 title={Die Entdeckung des Erdballs : Kühne Fahrten zu Wasser und zu Lande},
 type={Text},
 URL={http://www.rcin.org.pl/igipz/Content/120805/PDF/WA51_146578_PTG3530-r1924_Die-Entdeckung.pdf},
 keywords={geographical discoveries, history, biographies, discoverers, travelers, travels},
}