@misc{Robbins_Chandler_S._Progress_1974,
 author={Robbins, Chandler S. and Van Velzen, Willet T.},
 editor={Polska Akademia Nauk. Instytut Zoologii},
 editor={Meeting of the International Bird Census Committee (4 ; 1972 ; Dziekanów Leśny)},
 editor={Meeting of the European Ornithological Atlas Committee (2 ; 1972 ; Dziekanów Leśny)},
 copyright={Rights Reserved - Restricted Access},
 address={Warszawa},
 journal={Acta Ornithologica},
 howpublished={online},
 year={1974},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={eng},
 language={pol},
 language={rus},
 title={Progress Report on the North American Breeding Bird Survey},
 type={Text},
 keywords={breeding birds, Canada, United States, congresses, quantitative studies, geographical changes, population changes, birds, Aves},
}