1951
United States. Air Force
1:500k
1943
1:63k
1881
Wheeler, G.M.
1:507k
1807
Humboldt, Alexander von, 1769-1859
1:2m
1944
United States. Department of Commerce
1:500k
1861
Parke, John G.
1853
1951
United States. Air Force
1:500k
1882
Thayer, H.L.
1:1m
1897
Rand McNally and Company
1:2m