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By: Gonzalez, J L - Heredia, B - Gonzalez, Luis M. - Alonso, J CType: ArticleIn: Raptor researchVolume: 20Series:Issue: 2Date: 1986Page Range: 77--78Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]Subjects:
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By: Gonzalez, Luis M. - Hiraldo, F - Delibes de Castro, Miguel, - Calderón, Juan,Type: ArticleIn: Bulletin of the British Ornithologists' ClubVolume: 109Series:Issue:Date: 1989Page Range: 86--93Publication Info: London, British Ornithologists' Club, 1893-Subjects: