@misc{Tryjanowski_Piotr_The_1991, author={Tryjanowski, Piotr}, volume={47}, number={5}, copyright={Creative Commons Attribution BY 3.0 PL license}, journal={Let's protect Our Indigenous Nature}, address={Kraków}, howpublished={online}, year={1991}, publisher={Research Centre for the Protection of Nature and Natural Resources of the Polish Academy of Sciences}, language={pol}, type={Text}, title={The section of the Obra river valley in the province of Zielona Góra (The Green Mtns) deserves to be protected}, URL={http://rcin.org.pl/iop/Content/86414/PDF/KR038_105141_r1991-t47-no5_ChPO-Tryjanowski-112-114.pdf}, }