Oklahoma Government [Member] Oklahoma Government. Oklahoma U.S. Federal Government [Member] U.S. Federal Government. Corporate entity-level Alberta Government [Member] Alberta Government. Alberta UNITED STATES United States (U.S.) Wyoming Government [Member] Wyoming Government. Wyoming CANADA Canada North Dakota Government [Member] North Dakota Government. North Dakota New Mexico Government [Member] New Mexico Government. New Mexico Texas Government [Member] Texas Government. Texas Oil and natural gas. Oil and Natural Gas [Member]