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1932
Groebbels, F, Moebert F, Timmermann G.  1932.  Beitr. Verhandlungen ornithologische Gesellschaft Bayern. 19:542-554.
1930
Groebbels, F, Moebert F, Timmermann G.  1930.  . Beitr. 6:91-92.
Groebbels, F, Moebert F, Timmermann G.  1930.  Eine Beobachtung. Beitr. 6:136.

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