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Book
Year: 1900 Publisher: Chicago, IL : Chicago Academy of Sciences,
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Book
Year: 1914 Publisher: Urbana : Illinois state geological survey, University of Illinois,
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Book
Year: 1914 Publisher: Urbana Illinois state geological survey
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Book
Year: 1920 Publisher: Illinois state geological survey
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Book
Year: 1898 Publisher: Washington U. S. Geological Survey
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Book
Year: 1939 Publisher: Urbana, Ill. State Geological Survey
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Book
Year: 1898 Publisher: Washington, D.C. Department of the Interior, United States Geological Survey
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Invertebrates, Fossil --- Paleontology --- Paleontology --- Carboniferous Geologic Period. --- Invertebrates, Fossil. --- Paleontology. --- From 280 to 345 million years ago --- North America.
Book
Year: 1898 Publisher: Washington, D.C. Department of the Interior, United States Geological Survey
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Invertebrates, Fossil --- Paleontology --- Paleontology --- Carboniferous Geologic Period. --- Invertebrates, Fossil. --- Paleontology. --- From 280 to 345 million years ago --- North America.
Book
Year: 1898 Publisher: Washington, D.C. Department of the Interior, United States Geological Survey
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Invertebrates, Fossil --- Paleontology --- Paleontology --- From 280 to 345 million years ago --- North America.
Map
Year: 1912 Publisher: Washington, D.C. U.S Geological Survey
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