"Lake Duluth" . . . . . . . . . "396.24" . . "244620.288" . . . . "Lake Duluth" . . . . . . . . "Glacial Lake Duluth" . "Professional Paper 154\u2014A, Moriaines and Shore Lines of Lake Superior Basin: Frank Leverett; United States Government Printing Office, Washington; February 9, 1929" . . "117482.112" . . . .