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Daniells, Esther A.; Vélez Espinet, Nelson J.; Thorpe, Roger S.; Powell, Robert (Society for the Study of Amphibians and Reptiles, 2010)

Powell, Robert (Society for the Study of Amphibians and Reptiles, 1999)

Smith, Julia W.; Parmerlee, John S., Jr.; Powell, Robert (Society for the Study of Amphibians and Reptiles, 1995)

Powell, Robert; Gifford, Matthew E. (Society for the Study of Amphibians and Reptiles, 2010)

Powell, Robert; Henderson, Robert W (Society for the Study of Amphibians and Reptiles, 2008)

Henderson, Robert W.; Powell, Robert (Society for the Study of Amphibians and Reptiles, 1996)

Thomas, Richard; Powell, Robert (Society for the Study of Amphibians and Reptiles, 1995)

Powell, Robert; Pregill, Gregory K. (Society for the Study of Amphibians and Reptiles, 1991)

Powell, Robert; Crombie, Ronald I.; Boos, Hans E. A. (Society for the Study of Amphibians and Reptiles, 1998)

Powell, Robert (Society for the Study of Amphibians and Reptiles, 1999)