@misc{Witkowski_Zbigniew_Ten_1969, author={Witkowski, Zbigniew}, volume={25 nowa seria}, number={2}, copyright={Creative Commons Attribution BY 3.0 PL license}, address={Kraków}, journal={Let's protect Our Indigenous Nature}, howpublished={online}, year={1969}, publisher={Polish Academy of Sciences}, publisher={Państwowe Wydawnictwo Naukowe}, language={pol}, type={Text}, title={Ten years of the RIVON in the Netherlands}, URL={http://rcin.org.pl/Content/70694/PDF/KR038_91052_r1969-t25-no2_ChPO-Witkowski-70-72.pdf}, keywords={Netherlands, RIVON}, }