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Book
Year: 1982 Publisher: Washington (D.C.): US. Government printing office
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Book
Year: 1982 Publisher: Washington U. S. Geological Survey
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Book
Year: 1975 Publisher: Washington : United States Department of the Interior, Geological Survey,
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Geology, Stratigraphic --- Geology --- From 280 to 310 million years ago --- United States.
Book
Year: 1975 Publisher: Washington : United States Department of the Interior, Geological Survey,
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Geology, Stratigraphic --- Geology --- From 280 to 310 million years ago --- United States.
Book
Year: 1975 Publisher: Washington : United States Department of the Interior, Geological Survey,
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Geology, Stratigraphic --- Geology --- Geology. --- Geology, Stratigraphic. --- Pennsylvanian Geologic Period. --- From 280 to 310 million years ago --- United States.
Book
Year: 1975 Publisher: Washington : United States Department of the Interior, Geological Survey,
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Geology, Stratigraphic --- Geology --- Geology. --- Geology, Stratigraphic. --- Pennsylvanian Geologic Period. --- From 280 to 310 million years ago --- United States.
Book
Year: 1982 Publisher: Washington : United States Department of the Interior, Geological Survey,
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Geology --- Environmental protection --- Colorado --- United States
Book
Year: 1982 Publisher: Washington : United States Department of the Interior, Geological Survey,
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Geology --- Geology --- Environmental protection --- Environmental protection --- Environmental protection. --- Geology. --- Colorado --- United States
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