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Herald, E.S. & Ripley, W.E. (1951)
The relative abundance of sharks and bat stingrays in San Francisco Bay. California Fish and Game, 37(3), 315–329

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California sharks and rays. California Fish and Game Bulletin, 75, 88 pp., 65 figs

Ripley, W.E. (1946)
The biology of the soupfin Galeorhinus zyopterus and biochemical studies of the liver. California Fish and Game Bulletin, 64, 1–93