Attributes / relations provided by
♦ ¹Food Web Relationships of Northern Puget Sound and the Strait of Juan de Fuca : a Synthesis of the Available Knowledge, Charles A. Simenstad, Bruce S. Miller, Carl F. Nyblade, Kathleen Thornburgh, and Lewis J. Bledsoe, EPA-600 7-29-259 September 1979
♦ ²Diet of Harp Seals (Phoca groenlandica) in Divisions 2J and 3KL During 1991–93, J. W. Lawson, G. B. Stenson and D. G. McKinnon, NAFO Sci. Coun. Studies, 21: 143–154 (1994)