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warren-wilson.edu
C. Hamilton: Examination of Environmental Factors Affecting Foraging Success of Common Terns (Sterna hirundo), 26. januar 1998 LinkArhivirano 2012-03-20 na Wayback Machine.
web.archive.org
C. Hamilton: Examination of Environmental Factors Affecting Foraging Success of Common Terns (Sterna hirundo), 26. januar 1998 LinkArhivirano 2012-03-20 na Wayback Machine.