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Seventy-five years of changes in Mallard - Black Duck ratios in eastern North America

Paul A. Johnsgard, Rose Disilvestro
Publication Information
Journal: 
American Birds
Volume: 
30
Issue: 
5 (October)
Year: 
1976
Pages: 
905-908
AttachmentSize
PDF icon p00905-p00908.pdf250.34 KB
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