@misc{Staszkiewicz_Jerzy_The_1986, author={Staszkiewicz, Jerzy and Wójcicki, Jan J.}, volume={42}, number={4}, editor={Research Centre for the Protection of Nature and Natural Resources of the Polish Academy of Sciences}, copyright={Creative Commons Attribution BY 3.0 PL license}, address={Warszawa}, address={Kraków}, journal={Let's protect Our Indigenous Nature}, howpublished={online}, year={1986}, publisher={Państwowe Wydawnictwo Naukowe}, language={pol}, type={Text}, title={The last twenty years in the history of the birch Betula x oycoviensis Besser (pro spec.) in the environs of Cracow}, URL={http://rcin.org.pl/iop/Content/87765/PDF/KR038_109123_r1986-t42-no4_ChPO-Staszkiewicz-30-37.pdf}, keywords={birch, Betula oycoviensis}, }