Changes in Tundra Swan Cygnus columbianus bewickii distribution and abundance in the Yangtze River floodplain
Publisher: Cambridge University Press
E-ISSN: 1474-0001|21|3|260-265
ISSN: 0959-2709
Source: Bird Conservation International, Vol.21, Iss.3, 2011-09, pp. : 260-265
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Abstract