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Fence Diagram Shows general geologic structure and stratigraphy of North Dakota (48" x 32"). $2.50. |
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Cross Sections of Post-Pierre Strata in Western North Dakota These logs show typical Pierre Formation tops in western North Dakota, by C. G. Carlson, 1978. $2.00 |
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Stratigraphic Test Location Map Scale 1:500,000. $2.50. |