@misc{Barrows_Walter_Bradford_(1855–1923)_The,
 author={Barrows, Walter Bradford (1855–1923)},
 howpublished={online},
 publisher={Government Printing Office},
 language={eng},
 type={monografie},
 title={The common crow of the United States},
 keywords={ptaki, Stany Zjednoczone Ameryki 19w.},
}