| 1. |  | Oil workers doing a Silurian test, McKenzie County, N.D. | Men; Oil wells; Oil well drilling rigs; Petroleum workers; Petroleum industry; Machinery; Equipment; Chains; Hats; People; | Three men wearing hard hats and work clothes working on an oil well drilling rig doing a Silurian test overlooking Lake Sakakawea Texaco No. 3, Amerada, government, Dorough location in McKenzie County,... |
