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Aegolius funereus (Linnaeus 1758)
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n220_w1150
cc-publicdomain
Biodiversity Heritage Library
Flickr BHL
Our birds of prey Montreal,Dawson Brothers,1876.
biodiversitylibrary.org/page/14518397
n184_w1150
cc-publicdomain
Biodiversity Heritage Library
Flickr BHL
Manuel de l'ornithologiste préparateur Grenoble :Chez H. Bouteille,1845.
biodiversitylibrary.org/page/36295205
n244_w1150
cc-publicdomain
Biodiversity Heritage Library
Flickr BHL
Coloured illustrations of British birds, and their eggs /. London :G.W. Nickisson,1842-1850..
biodiversitylibrary.org/page/40246229
n190_w1150
cc-publicdomain
Biodiversity Heritage Library
Flickr BHL
The birds of America :. New York :J.B. Chevalier,1840-1844..
biodiversitylibrary.org/page/40383159
n221_w1150
cc-publicdomain
Biodiversity Heritage Library
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The birds of Europe.. London,Printed by R. and J.E. Taylor, pub. by the author,1837..
biodiversitylibrary.org/page/42174435
n184_w1150
cc-publicdomain
Biodiversity Heritage Library
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Fauna boreali-americana, or, The zoology of the northern parts of British America :. London :John Murray,1829-1837..
biodiversitylibrary.org/page/41549456