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Salazar-Hermoso, F.; Villavicencio-Garayzar, C. Relative Abundance of the Shovelnose Guitarfish Rhinobatos Productus (Ayres, 1856) (Pisces: Rhinobatidae) in Bahía Almejas, Baja California Sur, from 1991 to 1995. Cienc. Mar. 1999, 25, 401-422.