Cranswick, Peter A
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Wildfowl 56 - Standard Papers
Numbers and distribution of Bewick’s Swan Cygnus columbianus bewickii wintering in Britain and Ireland: results of international censuses, January 1995, 2000 and 2005
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Wildfowl 57 - Standard Papers
Numbers of Mute Swans Cygnus olor in Great Britain: results of the national census in 2002
Abstract PDF