Portland Public Library
Geology, Stratigraphic -- Permian
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http://bibfra.me/vocab/lite/Concept
Label
Geology, Stratigraphic -- Permian
Name
Geology, Stratigraphic
Focus
Geology, Stratigraphic
Sub focus
Permian
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Subject of
2
Gorgon, paleontology, obsession, and the greatest catastrophe in earth's history, Peter D. Ward
Extinction, how life on earth nearly ended 250 million years ago, Douglas H. Erwin
Outgoing Resources
Focus
1
Geology, Stratigraphic
Sub focus
1
Permian
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