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Implications of Age-Dependent Bill Length Variation in Empidonax for Identification of Immature Alder and Willow Flycatchers

David J. T. Hussell
Publication Information
Journal: 
Journal of Field Ornithology
Volume: 
61
Issue: 
1 (Winter)
Year: 
1990
Pages: 
54-63
AttachmentSize
PDF icon p0054-p0063.pdf630.32 KB
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