. . "Mississippi River" . . . . . . . "Gateways to commerce the U.S. Army Corps of Engineers' 9-foot channel project on the upper Mississippi River"@en . "History"@en . . . . . . "U.S. Army Corps of Engineers' 9-foot channel project on the upper Mississippi River"@en . . . . . . . . . . . "Gateways to commerce : the U.S. Army Corps of Engineers' 9-foot channel project on the upper Mississippi River"@en . "1900 - 1999" . .