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1
p4s�Ar/p3sp9sAr and K-Ar geochronology and tectonic significance of the Upper Cretaceous Adel Mountain volcanics and spatially associated Tertiary igneous rocks, northwestern Montana
Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey, 2005
Subjects: “...Geology, Stratigraphic Cretaceous....”

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Government Document Electronic Book
2
1999 resource assessment of selected tertiary coal beds and zones in the northern Rocky Mountains and Great Plains region
Denver, CO : U.S. Dept. of the Interior, U.S. Geological Survey : USGS Information Services [distributor], 1999
Version 1.1.
Subjects: “...Geology, Stratigraphic. fast https://id.worldcat.org/fast/940727...”

Government Document Electronic Book
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