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47
Geology, Stratigraphic
40
Powder River Basin (Wyo. and Mont.)
26
Petrology
18
Formations (Geology)
16
Borings
8
Oil well logging, Electric
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5
Geology, Structural
5
Shale
4
Electric logging
4
Sedimentary rocks
2
Geology
2
Mesaverde Group
2
Sandstone
1
Bentonite
1
Niobrara Formation
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