@misc{Sawicki_Ludwik_(1893–1972)_Szybik,
 author={Sawicki, Ludwik (1893–1972)},
 volume={42},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 journal={Spuścizna prof. Ludwika Sawickiego : teczki archiwalne},
 howpublished={online},
 language={pol},
 title={Szybik 1},
 type={Text},
 URL={http://rcin.org.pl/Content/75674/PDF/WA308_89845_A-TA-LS-42-1_Szybik-1_I.pdf},
 keywords={Szeląg (Poznań, Poland), geological research, Poznań, wielkopolskie voivodeship (Poland)},
}