@misc{_Acta_1971-1973,
 editor={Polska Akademia Nauk. Instytut Zoologii},
 copyright={Public Domain},
 address={Warszawa},
 journal={Acta Ornithologica},
 howpublished={online},
 year={1971-1973},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={pol},
 title={Acta Ornithologica ; t. 13 - Spis treści},
 type={Text},
 URL={http://rcin.org.pl/Content/15616/PDF/WA058_31886_P257-T13_Acta-Ornith-Spis-t13.pdf},
 keywords={Poland, birds, periodicals, ornithology},
}