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complete branch index for:
geology
caves
minerals
catlinite (pipestone or pipeclay)
stratigraphic
stratigraphic formations
oil fields
shales
Bakken shale
Barnett Shale
Chattanooga shale
Eagle Ford Formation
Fayetteville Shale
Haynesville Shale
Mancos shale
Marcellus Shale
radon in Marcellus shale formation
Monterey Shale
Niobrara shale
Utica shale
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