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Source: Calambokidis, J. A., Everitt, R. D., Cubbage, J. C., & Carter, S. D. (1979). Harbor Seal Census for the Inland Waters of Washington, 1977-1978. The Murrelet, 60(3), 110–112.
Image Alt Text: Common Seal (Phoca vitulina vitulina), off Lismore, Argyll
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