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Lignite drilling during 1977 in western North Dakota: Adams, Billings, Bowman, Dunn, Golden Valley, Grant, Hettinger, Mercer, Oliver, Slope, Stark, and Williams Counties
Lignite drilling during 1977 in western North Dakota: Adams, Billings, Bowman, Dunn, Golden Valley, Grant, Hettinger, Mercer, Oliver, Slope, Stark, and Williams Counties