Die vogelwarte Helgoland.
By: Von Heinrich Gätke ... Hrsg. von prof. Dr. Rudolf Blasius.
Contributors: Blasius, Rudolf, 1842-1907.
Publisher: J.H. Meyer
Published: 1891
Place of publication: Braunschweig
Language: ger
Number of pages: 609
Subjects: Birds -- Helgoland (Germany); Birds -- Migration