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Gavia familia. Gavia Bild aus Naumann Naturgeschichte der Vgel Mitteleuropas Band XII Tafel Gera biologie unihamburg de htm published in the mentioned book Johann Friedrich Naumann digitized by Peter Sengbusch In Public Domain use it as you wish Extract This drawing shows species Gavia arctica Prachttaucher Gavia immer Eistaucher