| 1. |  | Investors well USA #1 in middle of Lake Sakakawea aerial photograph, N.D. | Oil well drilling rigs; Oil wells; Petroleum industry; Lakes; Waterfronts; Mounds (Landforms); | An oddity in the petroleum industry of North Dakota was this Madison producer pictured above which in 1958 was the only marine and offshore drilling operation for thousands of miles. Owned at that... |