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Slaty-backed Gull winters on the Mississippi RiverTail patterns of these two species have been overlooked as important field characteristics in distinguishing between females whose abnormal coloration poses and identification problem.Detailed field identi

Authors
Ronald E. Goetz, William M. Rudden, Phoebe B. Snetsinger
Journal
American Birds
Volume
40
Issue
2 (Summer)
Year
1986
Pages
207-216
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