| 1. |  | The Black Hills (South Dakota) Flood of June 1972: Impacts and Implications | Floods -- South Dakota.; Floods -- Black Hills (S.D. and Wyo.); Floods -- South Dakota -- Rapid City. | USDA Forest Service General Technical Report RM-2 by Howard K. Orr, hydrologist. "Abstract: Rains of twelve inches or more in six hours fell on the east slopes of the Black Hills in the night of June 9,... |