Variant winter plumage in the Scaup
Harrison, James M. Harrison, Jeffery G.
Article
1962
Bulletin of the British Ornithologists' Club
82
43--43
BioStor
London, British Ornithologists' Club, 1893-
BioStor: https://biostor.org/reference/113104
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http://creativecommons.org/licenses/by-nc-sa/4.0/
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