[Reston, Va.] : U.S. Department of the Interior, U.S. Geological Survey, 2018.
1 online resource (2 unnumbered pages) : color illustrations, color maps.
The Upper Mississippi River System--topobathy.
Geological Survey (U.S.), author.
[Reston, Virginia] : U.S. Department of the Interior, U.S. Geological Survey, 2017.
1 online resource (4 unnumbered pages) : color illustrations, color maps.