Grand Valley State University
Pennsylvanian
Type
http://bibfra.me/vocab/lite/Temporal
Label
Pennsylvanian
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Geology, Stratigraphic -- Pennsylvanian -- Nomenclature
Geology, Stratigraphic -- Pennsylvanian -- Maps
Paleontology -- Pennsylvanian
Geology, Stratigraphic -- Pennsylvanian
Paleobotany -- Pennsylvanian
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