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Atlas de poche des oiseaux de France Suisse et Belgique utiles ou nuisibles Pl. XIII . XIII Indiffrent De passage Cygne sauvage Cygnus frus Famille des Anatids Pl XIII Illustration biodiversitylibrary org title Hamonville Jean Charles Louis Tardif NameFound Cygnus frus NameConfirmed Cygnus ferus Biodiversity Heritage