@misc{Okulewicz_Jerzy_(1940–2007)_Ptaki_1971,
 author={Okulewicz, Jerzy (1940–2007)},
 editor={Polska Akademia Nauk. Instytut Zoologiczny},
 copyright={Rights Reserved - Restricted Access},
 address={Warszawa},
 journal={Acta Ornithologica},
 howpublished={online},
 year={1971},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={pol},
 language={rus},
 language={eng},
 title={Ptaki miasta Olsztyna i okolic},
 type={Text},
 keywords={urban birds, birds, Poland, Olsztyn, city, countryside, changes, avifauna, Aves},
}