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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Haas, Volker - Siebenrock, K H
    Type: Article
    In: Scopus
    Volume: 7
    Date: 1983
    Page Range: 91--92
    Publication Info: Nairobi, East Africa Natural History Society's Ornithological Sub-committee,
  2. By: Haas, Volker - Haussler, U - Stick, R
    Type: Article
    In: Scopus
    Volume: 5
    Date: 1981
    Page Range: 128--128
    Publication Info: Nairobi, East Africa Natural History Society's Ornithological Sub-committee,