Worden, Jenny
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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 59 - Standard Papers
Population size and breeding success of the Icelandic Whooper Swan Cygnus cygnus: results of the January 2005 international census
Abstract PDF