Surface water supply of the United States, 1940, Part V, Hudson Bay and upper Mississippi River basin
1913 ◽
1935 ◽
1933 ◽
1915 ◽
1931 ◽
1928 ◽
Surface water supply of the United States, 1937, Part V, Hudson Bay and upper Mississippi River basin
1938 ◽
1919 ◽
1931 ◽
1918 ◽
