@misc{Birkenmajer_Krzysztof_Ochrona_1965,
 author={Birkenmajer, Krzysztof},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Kraków},
 howpublished={online},
 year={1965},
 publisher={Research Centre for the Protection of Nature of the Polish Academy of Sciences},
 language={pol},
 title={Ochrona przyrody nieożywionej},
 type={Text},
 URL={http://rcin.org.pl/Content/215595/PDF/KR038_253112_r1965-t1_OPijZ-Birkenmajer-242-260.pdf},
 keywords={geology, inanimate nature conservation},
}