1973
NOS Lake Survey Center
1:120k
1929
International Boundary Commission
1:24k
1929
International Boundary Commission
1:24k
1973
U.S. Lake Survey
1:1m
1880
US NAVY HYDROGRAPHIC OFFICE
1:213k
1973
NOS Lake Survey Center
1:600k
1973
NOS Lake Survey Center
1:600k
1956
Shell Oil Company
1:950k
1929
International Boundary Commission
1:60k
1879
Rand McNally and Company
1:2m