TY  - RPRT
TI  - Quality of surface waters of the United States, 1951. Parts 5 and 6, Hudson Bay and upper Mississippi River basins and Missouri River Basin
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1956
DO  - 10.3133/wsp1198
UR  - https://pubs.usgs.gov/publication/wsp1198
ID  - wsp1198
ER  -