@misc{Dyrcz_Andrzej_Ornithological_1969, author={Dyrcz, Andrzej and Tomiałojć, Ludwik (1939– )}, volume={25 nowa seria}, number={4}, copyright={Creative Commons Attribution BY 3.0 PL license}, journal={Let's protect Our Indigenous Nature}, address={Kraków}, howpublished={online}, year={1969}, publisher={Polish Academy of Sciences}, publisher={Państwowe Wydawnictwo Naukowe}, language={pol}, title={Ornithological aspects of the protection of marshes on the Biebrza river}, type={Text}, URL={http://rcin.org.pl/Content/124095/PDF/KR038_143014_r1969-t25-no4_ChPO-Dyrcz-38-42.pdf}, keywords={Biebrza Marshes, Czerwone Bagno, Bagno Ławki, Bagno Podlaskie}, }