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U.S. Geological Survey Open-File Report 03-039
Figure 1

National Petroleum Reserve in Alaska

Figure 1.  Stratigraphy in the National Petroleum Reserve in Alaska (NPRA) showing stratigraphic positions of Brookian stratigraphic plays, known oil source rocks, and known oil accumulations (including heavily oil-stained Torok outcrops).

U.S. Department of the Interior, U.S. Geological Survey
URL: http://pubs.usgs.gov/of/2003/of03-039/fig1.htm
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