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Institution
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Subject
37
Geology, Stratigraphic
27
Powder River Basin (Wyo. and Mont.)
20
Petrology
14
Formations (Geology)
13
Borings
6
Oil well logging, Electric
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5
Shale
3
Stratigraphic correlation
2
Mesaverde Group
2
Paleontology
2
Sandstone
2
Sedimentary rocks
1
Animals, Fossil
1
Bentonite
1
Niobrara Formation
1
Rocks
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