@misc{Dyrcz_Andrzej_Ptaki_1973, author={Dyrcz, Andrzej}, volume={R. 38}, editor={Research Centre for the Protection of Nature of the Polish Academy of Sciences}, copyright={Creative Commons Attribution BY 3.0 PL license}, address={Warszawa}, address={Kraków}, journal={Protection of Nature}, howpublished={online}, year={1973}, publisher={Państwowe Wydawnictwo Naukowe}, language={pol}, type={Text}, title={Ptaki polskiej części Karkonoszy}, title={The birds of the Polish part of the Karkonosze Mountains}, URL={http://rcin.org.pl/iop/Content/145746/PDF/KR038_140713_r1973-r38_OP-Dyrcz-213-284.pdf}, keywords={Karkonosze Mountains}, }