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3. Intrapopulation variation in the body size at metamorphosis and timing of metamorphosis in the bullfrog, Rana catesbeiana;Collins;Ecology,1979
4. Current status of amphibian culture with special emphasis on nutrition, diseases and reproduction of the bullfrog, Rana castesbeiana;Culley,1978
5. Biology of Amphibians;Duellman,1986