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Key to the Sharks, Skates, and Ratfish of Alaska 1 One gill slit on each side of head, covered by an opercle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 18
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Document Date: 2007-12-18 21:13:23
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Key to the Sharks, Skates, and Ratfish of Alaska 1 One gill slit on each side of head, covered by an opercle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 18