@misc{Ormicki_Wiktor_Rudolf_(1898–1941)_Naturalny_1938,
 author={Ormicki, Wiktor Rudolf (1898–1941)},
 copyright={Public Domain},
 address={Warszawa},
 howpublished={online},
 year={1938},
 publisher={[s.n.]},
 language={pol},
 language={eng},
 title={Naturalny obrót ludności},
 type={Text},
 URL={http://www.rcin.org.pl/igipz/Content/4126/PDF/WA51_6926_PAN15577-r1938_Naturalny-obrot.pdf},
 keywords={demography, population, Poland, 19th-20th century},
}