Published in Journal für Ornithologie, in 1876, in volume 24, pages 79-84
Created: 2014-09-04, modified: 2014-09-04![](https://www.biodiversitylibrary.org/pagethumb/8884199,60,60)
Published in The Great Basin Naturalist, in 1983, in volume 43, pages 425-428
Created: 2017-11-16, modified: 2017-11-16![](https://www.biodiversitylibrary.org/pagethumb/51279436,60,60)
Published in Journal of Raptor Research, in 1988, in volume 22, issue 4, pages 107-115
Created: 2017-04-07, modified: 2017-04-07![](https://www.biodiversitylibrary.org/pagethumb/51279430,60,60)
Published in Journal of Raptor Research, in 1988, in volume 22, issue 4, pages 101-106
Created: 2017-04-07, modified: 2017-04-07![](https://www.biodiversitylibrary.org/pagethumb/32705017,60,60)
Published in Journal für Ornithologie, in 1888, in volume 36, pages 313-571
Created: 2014-09-04, modified: 2014-09-04