1928
Great Northern Iron Ore Properties (Firm : Saint Paul, Minn.)
1:67k
1938
Antoncich, Frank
1:85k
1955
Antoncich, Frank
1:85k
1901
Cram, George
1886
1:32k
1902
U. S. Geological Survey
1:63k
1891
Roe, Frederick B.
1:32k
1887
Patton & Drew
1:26k
1973
U.S. Lake Survey
1:42k
1951
United States. Air Force
1:500k