@misc{Sawicki_Ludwik_(1893–1972)_Szurf, 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={Szurf IV}, type={Text}, URL={http://www.rcin.org.pl/iae/Content/75680/PDF/WA308_89847_A-TA-LS-42-3_Szurf-IV_I.pdf}, keywords={geological research, Szeląg (Poznań, Poland), Poznań, wielkopolskie voivodeship (Poland)}, }