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2001. United States. Minerals Management Service. This polygon shapefile shows the official protraction diagram (OPD) and leasing map boundaries for the United States, covering areas of the Outer C... Geological Survey (U.S.).
2014. National Energy Information Center (U.S.). This polygon shapefile contains petroleum administration areas for defense districts (PADDs) within the United States as of 2014. PADDs are geograp... National Energy Information Center (U.S.).