Die vogelwarte Helgoland Gätke, Heinrich, 1814-1897 creator Blasius, Rudolf, 1842-1907 contributor text book Braunschweig J.H. Meyer 1891 1891
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GER Birds Helgoland (Germany) Migration QL690.G3 G12v 1891 https://www.biodiversitylibrary.org/bibliography/14467 12261467 10.5962/bhl.title.14467 SMI