@misc{Sawicki_Ludwik_(1893–1972)_Geomorfologia,
 author={Sawicki, Ludwik (1893–1972)},
 volume={49},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 journal={Spuścizna prof. Ludwika Sawickiego : teczki archiwalne},
 howpublished={online},
 language={pol},
 title={Geomorfologia pradoliny Wisły okolic Warszawy},
 type={Text},
 URL={http://www.rcin.org.pl/Content/77110/PDF/WA308_90352_A-TA-LS-49-4_Geomorfologia-prado_I.pdf},
 keywords={regional geology -- Poland, regional morphology -- Poland, Warsaw, mazowieckie voivodeship-region (Poland)},
}