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1“... States. United States Geological Survey Professional Paper, 523 - D, 1 - 43. https: // doi. org / 10.3133...”
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2“... States. United States Geological Survey Professional Paper, 523 - D, 1 - 43. https: // doi. org / 10.3133...”
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3“... Ordovician. United States Geological Survey Professional Paper, 1579, 1-50.", "Whittington, H.B. (1948) A new...”
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4“... Antarctica. Geological Survey of America Professional Papers 456 (D): 1 - 37.", "KIAER J. 1917. - The Lower...”
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5“... Antarctica. Geological Survey of America Professional Papers 456 (D): 1 - 37.", "KIAER J. 1917. - The Lower...”
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6“... in the United States. United States Geological Survey Professional Paper, 374 - F, 1 - 49.", "Walcott, C. D...”
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7“... in the United States. United States Geological Survey Professional Paper, 374 - F, 1 - 49.", "Walcott, C. D...”
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8“...) The Ibexian, lowermost series in the North American Ordovician. United States Geological Survey Professional...”
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9“... Geological Survey Professional Paper, 374-F, 1-49.", "Palmer, A.R. (1971) The Cambrian of the Great Basin...”
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10“... Adeorbidae) from the Western Pacific Islands. United States Geological Survey Professional Papers, 531, 1...”
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11“... Adeorbidae) from the Western Pacific Islands. United States Geological Survey Professional Papers, 531, 1...”
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12“.... United States Geological Survey Professional Paper, 374 - F, 1 - 49.", "Adrain, J. M. & Westrop, S. R...”
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13“.... United States Geological Survey Professional Paper, 374 - F, 1 - 49.", "Adrain, J. M. & Westrop, S. R...”
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