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within Paul Ruthke
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G. Niethammer, H. E. Wolters, Klaus Witt, Frank Hampel… in Journal für Ornithologie (1964)
Paul Ruthke, Margrit Frantzen, Wolfgang Winkel, G. Mauersberger in Journal für Ornithologie (1963)
Gisela Deckert, H. Mester, H. Freih, Geyr v. Schweppenburg… in Journal für Ornithologie (1958)
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