@misc{Sawicki_Ludwik_(1893–1972)_Zielonka_1957,
 author={Sawicki, Ludwik (1893–1972)},
 volume={48},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 journal={Spuścizna prof. Ludwika Sawickiego : teczki archiwalne},
 howpublished={online},
 year={1957},
 language={pol},
 title={Zielonka pod Warszawą},
 type={Text},
 URL={http://rcin.org.pl/Content/77091/PDF/WA308_90184_A-TA-LS-48-7_Zielonka-pod-Warszaw_I.pdf},
 keywords={geology of the site, Zielonka, Wołomin county, mazowieckie voivodeship (Poland)},
}