Coal stratigraphy and correlation in the Sidney 30x60-minute quadrangle, eastern Montana and adjacent North Dakota [cartographic material] : Paleogeographic diagrams of the Prittegurl, Pust, Elvirio, Sears, Budka, and Lane intervals / by J.E. Mathews ; prepared in cooperation with the U.S. Geological Survey. Raster Massachusetts Institute of Technology Public content

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