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    Specialized Issues (6th ed.). Krause Publications. ISBN 0-87341-149-8. giervalk.bravepages.com – images of Barbadian banknotes. Archived 8 July 2011 at...
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    generally named after its use in falconry, whereas the modern Dutch name giervalk is peculiarly ambiguous: gier means "vulture", whereas gieren means changing...
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    Warblers (Acrocephalus scirpaceus) trapped during nocturnal migration". De Giervalk/Le Gerfaut. 80: 149–158. Ali, Salim; Ripley, S. Dillon (1980). Handbook...
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  • en Republique du Rwanda (1959 à 1965)" in the magazine Le Gerfaut: De Giervalk. From 1962 to 1971 he was a research assistant at the Royal Museum for...
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  • massif montagneux du Tibesti et distribution de ces espèces en Afrique du Nord et environs". Le Gerfaut: De Giervalk (in French). 55 (1): 26–69. v t e...
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    distribution de ces espèces en Afrique du Nord et environs". Le Gerfaut: De Giervalk (in French). 55 (1): 26–69. Ararat, Korsh; Fadhil, Omar; Porter, R F; Salim...
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  • Aegotheles savesi, with Comments on the Systematics of the Aegothelidae". De Giervalk / Le Gerfaut. 77: 341–352. Cracraft, J (1968). "A Review of the Bathornithidae...
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