House documents, 80th Congress. 222. Mississippi River in vicinity of Prairie du Rocher, Ill., letter from chief of engineers, Army, submitting report on review of report on Mississippi River between Coon Rapids Dam and mouth of Ohio River, with view to providing Hood protection in reach between mouth of Kaskaskia River and Fort Chartres and Ivy Landing drainage and levee district with particular reference to Prairie du Rocher. Ill.