1880
US NAVY HYDROGRAPHIC OFFICE
1:213k
1905
U.S. Lake Survey
1:120k
1871
Corps of Engineers
1:30k
1946
U.S. Lake Survey
1:120k
1936
Upper Peninsula Development Bureau
1929
International Boundary Commission
1:6k
1973
NOS Lake Survey Center
1:600k
1973
NOS Lake Survey Center
1:600k
1929
International Boundary Commission
1:6k
1956
Shell Oil Company
1:950k